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Testes
Primary reproductive organs located in the scrotum
Produce sperm (spermatogenesis)
Secrete testosterone and other androgens
Optimal function requires temperature lower than body temperature
Scrotum
External sac that houses the testes
Provides temperature regulation for sperm production
Contains muscles that can raise or lower testes for thermoregulation
Epididymis
Coiled tubular structure attached to each testis
Provides site for sperm maturation and storage
Connects testes to vas deferens
Vas Deferens
Muscular tubes that transport sperm from epididymis to urethra
Forms part of the spermatic cord
Prostate Gland
Primary accessory sex gland in male dogs and cats
Produces seminal fluid components that nourish and transport sperm
Surrounds the urethra at the neck of the bladder
Urethra
Conducts both urine and semen
Extends from bladder through the prostate and penis
Penis
Male copulatory organ
Contains erectile tissue for breeding
In dogs, includes the os penis (bone) and bulbus glandis (for "locking" during breeding)
Prepuce
Protective fold of skin covering the penis when not erect
Ovaries
Paired primary reproductive organs
Produce oocytes (eggs)
Secrete hormones including estrogen and progesterone
Control reproductive cycles
Oviducts
Paired tubes extending from ovaries to uterine horns
Site of fertilization
Transport ova/embryos to uterus
Uterus
Bicornuate structure (two horns, one body) in dogs and cats
Receives, implants, and nourishes developing embryos
Expels fetuses during parturition
Undergoes cyclic changes in response to hormones
Cervix
Connects uterus to vagina
Controls entry into uterus
Creates barrier between uterus and vaginal environment
Dilates during estrus and parturition
Vagina
Tubular structure extending from cervix to vulva
Receives penis during copulation
Serves as birth canal during parturition
Vulva
External genitalia including the vestibule, labia, and clitoris
Provides protection for internal reproductive structures
Changes appearance during different reproductive stages
Mammary glands
Modified skin glands arranged in two parallel rows
Produce milk for nourishment of offspring
Respond to reproductive hormones
Dogs typically have 5 pairs; cats typically have 4 pairs
Pregnancy
Cats can typically be diagnosed with pregnancy earlier (21-28 days after breeding) compared to dogs (25-36 days). Ultrasonography can detect pregnancy in both species around 20 days post-breeding, while radiography becomes useful after 45 days when fetal skeletal mineralization occurs.
Dystocia
Causes:
Fetal factors
oversized fetuses
fetal abnormalities (anasarca, hydrocephalus)
abnormal positioning
breech position is normal in dogs and cats
Maternal factors
narrowed birth canal (development or trauma-related)
primary uterine intertia (lack of coordinated contractions)
secondary uterine intertia (exhaustion from prolonged labor)
Dystocia clinical signs
Labor lasting longer than 4 hours without producing a fetus
Green vaginal discharge during parturition
More than 1 hour elapsed between births
Straining without productive delivery
Maternal distress
Dystocia diagnosis
Physical examination with digital vaginal palpation
Radiography to evaluate:
Fetal position
Fetal size
Number of remaining fetuses
Ultrasonography to assess:
Fetal viability
Signs of fetal distress
Dystocia treatment
manual manipulation
carefully dislodge fetus lodged in vaginal canal
medical management
oxytocin administration
calcium supplementation if hypocalcemia is present
surgical intervention
cesarean delivery if medical treatment fails
can be combined with OVH in non-breeding animals
dystocia client education
Appropriate breeding practices (avoiding extremely disparate size matings)
Prepare a whelping box and accustom the animal to it before delivery
Ensure proper nutrition both before, during and after pregnancy
Supervise birthing but avoid creating stress
Recognize when veterinary intervention is needed
Special care may be needed for neonates after cesarean delivery
Eclampsia (Puerperal Tetany)
Cause
Hypocalcemia due to:
Heavy lactation demands
Calcium-deficient diet
Insufficient calcium mobilization from bones
Most common 2-3 weeks after whelping
More common in small breed dogs with large litters
Rare in cats compared to dogs
Clinical signs of eclampsia
Nervousness and restlessness
Salivation
Stiff gait progressing to ataxia
Muscle tremors
Hyperthermia
Tachycardia
Seizures in advanced cases
Eclampsia Diagnosis
Clinical signs in a lactating female
Low serum calcium levels
Response to calcium therapy
Ruling out other causes of neurological signs
Eclampsia Treatment and prevention
Emergency treatment
Slow intravenous administration of 10-20% calcium gluconate
Heart rate monitoring during administration
Stop infusion if bradycardia or arrhythmias occur
Follow up care
Oral calcium supplementation
Serum calcium monitoring throughout lactation
Weaning puppies/kittens or supplemental feeding if severe
Prevention
Adequate prenatal nutrition
Calcium supplementation during late pregnancy and lactation
Limit litter size in susceptible animals
Eclampsia Client Education
Eclampsia tends to recur in subsequent pregnancies
Affected animals may not be suitable for breeding
Importance of proper nutrition during pregnancy and lactation
Recognition of early signs requiring immediate veterinary attention
Proper calcium supplementation protocols
Monitoring nursing frequency and duration
Pyometra Causes
Progressive uterine disease related to hormonal influences
repeated exposure to progesterone during estrous cycles
cystic endometrial hyperplasia progressing to fluid accumulation
Secondary bacterial infection (most commonly E. Coli)
other potential organisms: staph, streptococcus, klebsiella, pasteurella, proteus, moraxella
Risk factors:
Middle aged to older females
typically occurs within 60 days after estrys
previous hormonal treatments (estrogen, progestins)
Nullparity (never having given birth)
Pyometra clinical signs
Vulvar discharge (open-cervix pyometra)
May be absent in closed-cervix pyometra
Abdominal enlargement
Vomiting
Lethargy
Polyuria/polydipsia
Dehydration
Azotemia (elevated kidney values)
Fever
Pyometra diagnosis
Radiography: enlarged fluid-filled uterus
Ultrasonography: fluid-filled uterus (differentiates from pregnancy)
Laboratory findings:
CBC: leukocytosis, neutrophilia with left shift, dehydration
Possible nonregenerative anemia
Serum chemistry: increased alkaline phosphatase, elevated proteins, increased BUN
Vaginal cytology: degenerative neutrophils, endometrial cells, bacteria
Bacterial culture and sensitivit
Pyometra client education
Ovariohysterectomy is the definitive treatment and prevention
Early, aggressive treatment is essential
Significant mortality rate - even with proper treatment
High recurrence rate within 1 year if medical treatment only
Medical treatment more successful with open-cervix pyometra
Recognition of signs requiring immediate veterinary attention
Lifetime risk in intact females increases with age
Pseudopregnancy in dogs and cats
Pseudopregnancy (also known as false pregnancy) is a physiologic syndrome characterized by signs mimicking those of normal pregnancy in non-pregnant female animals. This condition is fairly common in intact female dogs (bitches) but uncommon in female cats (queens).
In dogs, pseudopregnancy represents an exaggeration of the normal hormonal changes that occur during the estrous cycle. While all non-pregnant bitches experience some degree of pseudopregnancy physiologically, only some display overt clinical signs.
Pseudopregnancy causes
Hormonal mechanism:
Abrupt drop in progesterone levels at the end of diestrus
Increased prolactin secretion playing a central role
All non-pregnant bitches are physiologically "pseudopregnant" but with variable intensity of signs
Can be triggered by ovariohysterectomy or ovariectomy during the luteal phase
Species differences
Common in dogs, particularly in certain breeds
Rare in cats due to differences in reproductive physiology (induced ovulators)
More pronounced in nulliparous bitches (female that has never previously given birth)
Contributing factors
Previous pseudopregnancy episodes increase risk of recurrence
Possible genetic predisposition
Stress or environmental factors may play a role
Individual sensitivity to hormonal fluctuations
psuedopregnancy clinical signs
behavioral signs
Restlessness and anxiety
Decreased activity
Anorexia
Licking at abdomen
Aggression (may be protective)
Maternal behaviors:
Nesting behavior
"Mothering" of inanimate objects (carrying toys)
Protective behavior over toys or bedding
physical signs
Weight gain
Mammary gland enlargement
Lactation (milk production)
Mucoid vaginal discharge
timing
Usually develops 6-12 weeks after estrus in dogs
Typically lasts 1-3 weeks if untreated
Signs are self-limiting in most cases
species differences
Dogs typically show more pronounced signs
Cats rarely display overt pseudopregnancy symptoms
pseudopregnancy diagnosis
Based primarily on:
Compatible clinical signs in a non-pregnant intact female
History of recent estrus (approximately 2 months prior)
Physical examination findings
Ruling out actual pregnancy
Diagnostic approach
-No specific diagnostic tests available
Hormonal assays are non-diagnostic
Ultrasonography to rule out pregnancy
Radiography (after 45 days) can rule out pregnancy
pseudopregnancy treatment
Conservative management
Most cases resolve without treatment
Avoidance of mammary stimulation
Mild water restriction
Diuretics in some cases
Prevention of self-stimulation (Elizabethan collar if necessary)
Pharmacological intervention
prolactin-inhibitng drugs
surgical management
Ovariohysterectomy is the only permanent cure
Should be performed during anestrus
Surgery during luteal phase can induce pseudopregnancy
psuedopregnancy client ed
Explain that pseudopregnancy is a normal physiological process in dogs
Reassure that it is typically self-limiting
Explain the hormonal basis for the condition
Increased risk of mammary tumors in intact females
Discuss spaying as a permanent solution for non-breeding animals
Explain importance of timing spay surgery during anestrus
Review likelihood of recurrence in subsequent cycles
When to seek veterinary care:
Severe behavioral changes affecting quality of life
Excessive milk production leading to discomfort
Signs persisting beyond 3 weeks
Any indication of mammary infection
Lactation Disorders
Causes
Bacterial infection (often ascending through teat canal)
Milk stasis
Trauma to mammary glands
poor hygeine
stress
Predisposing factors:
Agalactia (lack of milk production)
Malnutrition
Premature parturition
Clinical signs
mammary discomfort and pain
discolored milk (may be bloody or purulent)
fever
reluctance to allow nursing
hard, hot mammary glands
abscess formation in chronic cases
systemic illness in severe cases
Diagnosis
physical examination of mammary glands
milk cytology
bacterial culture and sensitivity
complete blood count may show inflammation
Treatment
antimicrobial therapy
broad spectrum antibiotics
supportive care
warm compress to affected glands
gentle expression of affected glands
protection from trauma
pain management
Client education
mastitis may recur in subsequent lactations
good hygeine during lactation
puppies and kittens should not nurse from affected gland but can from unaffected teats
hand feeding techniques if necessary
signs of worsening infection require immediate veterinary care
Prostatic disease
represents an important category of male reproductive disorders with significant differences in prevalence between dogs and cats
prostate gland
located caudal to the bladder and encircling proximal urethra
produces fluid that serves as a transport medium for sperm
prostatic diseases are far more common in dogs
Prostate disorders causes
Benign prostatic hyperplasia:
Associated with aging process in intact male dogs (as early as 2.5 years)
Caused by altered androgen-estrogen ratio
Requires the presence of functional testes
Normal age-related change in dogs
Rare in cats due to different prostatic structure and hormone responsiveness
Prostatitis
Bacterial infection through the urinary system or direct infection
Common causative organisms:
Escherichia coli (most frequent)
Other gram-negative bacteria (Proteus, Klebsiella, Pseudomonas)
Gram-positive bacteria (Streptococcus, Staphylococcus)
Brucella canis
Affects sexually mature male dogs
May be acute or chronic
Predisposed by prostatic hyperplasia
Extremely rare in cats
Prostatic Abscessation
Severe form of bacterial prostatitis
Development of pockets of purulent exudate within the gland
Secondary to chronic bacterial infection
May occur following trauma or obstruction
Almost exclusively seen in dogs
Prostatic neoplasia
Uncommon in dogs but can develop in both intact and neutered males
All prostatic tumors in dogs are malignant
Adenocarcinoma is the most common type
Rarely reported in cats but can occur
benign prostatic hyperplasia clinical signs
Often asymptomatic
Tenesmus (straining to defecate)
Symmetrically enlarged, non-painful prostate on palpation
May cause hematuria or urethral discharge
prostatitis clinical signs
Acute form:
Anorexia
Fever
Lethargy
Stiff gait in rear limbs
Caudal abdominal pain
Possible septicemia in severe cases
Chronic form:
May be asymptomatic
History of recurrent urinary tract infections
Intermittent urethral discharge
Occasional discomfort
prostatic abscessation clinical signs
Tenesmus
Urethral discharge
Lethargy
Pain
Vomiting
Hematuria
Fever
Depression
Potential for peritonitis if abscess ruptures
prostatic neoplasia clinical signs
Similar to other prostatic diseases initially
Progressive weight loss
Symmetrically or asymmetrically enlarged prostate
Potential metastasis to regional lymph nodes, lungs, and bones
Increased frequency of urination
Poor response to antibiotics or castration
Lumbar pain from metastasis
prostate disease diagnosis general approach
Thorough physical examination including rectal palpation
Urinalysis and urine culture
Complete blood count and serum chemistry
Imaging (radiography, ultrasonography)
Prostatic fluid cytology and culture
Biopsy for definitive diagnosis
benign prostatic hyperplasia diagnosis
Physical examination reveals symmetrically enlarged, non-painful prostate
Biopsy provides the only accurate diagnosis
Ruling out other prostatic conditions
prostatitis diagnosis
Urinalysis: blood, increased white blood cell count, bacteria
Urine culture to identify causative organism
Prostatic wash or massage for cytology and culture
Ultrasonography
prostatic abscessation diagnosis
CBC may show leukocytosis or normal WBC count
Elevated liver enzymes
Hypoglycemia and hypokalemia in severe cases
Prostatic aspiration reveals hemorrhagic, purulent, septic material
Ultrasonography sProstatic Neoplasia:
Often requires biopsy for definitive diagnosis
Radiographs to check for metastasis
Prostatic wash cytology may reveal neoplastic cells
Advanced imaging (CT, MRI) for staging
benign prostatic hyperplasia treatment
Castration (results in 70% decrease in size within 7-14 days)
Medical options:
Low-dose estrogen therapy
Prevention through early castration
Note: Medical treatments provide temporary improvement; condition recurs when therapy ends
prostatitis treatment
extended antibiotic therapy based on culture and sensitivity:
Acute form: 28 days
Chronic form: at least 6 weeks
Castration may be beneficial
Prostatectomy in severe cases (difficult surgery with serious side effects)
prostatic abscessation treatment
Surgical drainage (treatment of choice)
Castration
Appropriate antibiotic therapy
Intravenous fluid therapy for sepsis or peritonitis
Regular monitoring and follow-up
prostatic neoplasia treatment
Generally poor prognosis
Palliative treatment options:
Prostatectomy (rarely curative)
Radiation therapy
Chemotherapy
Pain management
client education - prostate disease
benign prostatic hyperplasia
Early castration prevents this condition
Castration effective even in older animals
Drug therapy results in temporary improvement only
Regular monitoring for progression
Be aware of potential side effects of estrogen therapy (bone marrow suppression)
Prostatitis
Long-term antibiotic therapy is essential for control
Monitoring with prostatic fluid cultures and examinations needed during extended antibiotic use
Castration may be beneficial
Importance of completing the full course of antibiotics
Disease may become chronic if inadequately treated
Prostatic abscessation
Treatment is expensive and challenging
Survival rate approximately 50% after 1 year
Close monitoring required post-treatment
Risk of recurrence
Potential for life-threatening complications
Prostatic neoplasia
Poor prognosis in most cases
Treatment mainly palliative rather than curative
Quality of life considerations important
Regular monitoring for pain management
Focus on comfort and maintaining normal activities as long as possible
priapism
persistent penile erection without sexual stimulation
paraphimosis
inability to retract the penis into the preputial sheath
priapism in dogs
In dogs, priapism is occasionally observed and while often primarily a concern for embarrassed owners, it can cause considerable pain and potentially lead to tissue necrosis requiring amputation if left untreated.
Species differences:
Cats may develop priapism following castration (not common in dogs)
Dogs have an os penis (penis bone) which can fracture and cause paraphimosis
Different anatomical structures of the prepuce between species
priapism causes
Myelopathy (spinal cord disorders)
Drug reactions
Vascular abnormalities
Penile masses
Trauma
Castration (specific to cats)
Idiopathic (no identifiable cause)
Excessive parasympathetic stimulation
Impaired venous drainage from the penis
Classification:
Nonischemic priapism (more common in both species)
Ischemic priapism (less common but more serious)
priapism clinical signs
Persistent erection without sexual stimulation
Potentially painful condition
Penile congestion
Possible discoloration of penile tissue
Discomfort during urination
Reluctance to move
In severe cases:
Tissue drying
Progressive necrosis if untreated
Gangrene in advanced cases
priapism diagnosis
History to identify potential causes
Physical examination showing persistent erection
Differentiation between nonischemic and ischemic forms:
Ultrasonography of the penis (confirmatory test)
Color Doppler to assess blood flow
Neurological examination if myelopathy suspected
Toxicology if drug reaction suspected
Blood work to rule out systemic causes
priapism treatment
Pain control-Gabapentin:
Terbutaline
Pseudoephedrine (extra label use):
****Consider switching medications if no response after several days
Surgical options:
For ischemic priapism in cats: penile amputation and perineal urethrostomy
Surgical incisions in tunica albuginea with heparinized saline irrigation
In severe necrosis: amputation of penis and prepuce with urethrostomy
Duration assessment is critical for prognosis
Evaluation of tissue damage extent
Urinary function assessment
priapism client education
Importance of seeking prompt veterinary attention
Explanation that this is a medical emergency
Discussion of treatment options and prognosis
Follow-up care requirements
paraphimosis cause
self mutilation
constriction by hair ring
fracture of os penis
trauma
strangulation with rubber band or string
excessive sexual excitement without return to flaccid state
preputial abnormalities
neurologic disorders
paraphimosis clinical signs
Exposed penis unable to retract into preputial sheath
Progressive swelling of exposed tissue
Drying of penile tissue
Potential tissue trauma
Pain and discomfort
Licking or biting at the affected area
Difficulty urinating
Signs of progressive tissue deterioration:
Discoloration
Necrosis
Contamination
Time-dependent severity:
Acute presentation may be less severe
Chronic exposure leads to progressive tissue damage
Increasing pain and systemic illness with prolonged exposure
paraphimosis diagnosis
Visual confirmation of exposed, non-retractable penis
Assessment for constricting objects (hair rings, foreign material)
Evaluation of tissue viability
Examination for underlying causes:
Trauma
Fractures of os penis (radiography)
Congenital abnormalities
paraphimosis treatment
acute
Sedation
Removal of causative agents (hair rings constricting material)
Cold hypertonic glucose solution to reduce swelling
Gentle cleaning of penile tissue
Lubrication and manual replacement into prepuce
Purse-string suture placement at preputial opening (temporary)
chronic or non-responsive cases
Chronic or non-responsive cases:
Surgical intervention
Penile amputation and urethrostomy in severe cases
Reconstructive procedures for preputial abnormalities
Duration assessment is critical for prognosis
Evaluation of tissue damage extent
Urinary function assessment
paraphimosis client education
Emergency nature of the condition
Time-dependent complications
Importance of not attempting forceful reduction at home
Potential for serious tissue damage if left untreated
Prevention strategies:
Regular grooming for long-haired animals
Monitoring during periods of sexual excitement
Vigilance for abnormal penile exposure
Brucellosis
significant infectious disease of zoonotic importance that affects multiple species, including dogs. The disease is primarily caused by Brucella canis in canines, though dogs can occasionally become infected with other Brucella species through exposure to infected domestic production animals.
Unlike in dogs, brucellosis in cats is extremely rare, with very few documented cases reported in the literature. This significant species difference likely relates to variations in susceptibility, exposure patterns, and physiological responses to Brucella organisms.
brucellosis cause
Brucella canis - primary agent in dogs
Small, intracellular, gram-negative, non-spore-forming, aerobic coccobacillus
Dogs can occasionally be infected with other Brucella species:
Dogs are the preferred host for B. canis
brucellosis mode of transmission
Venereal transmission (major route)
Ingestion of contaminated materials
Contact with aborted tissues or vaginal fluids through broken skin
Conjunctival and oronasal exposure to:
Infected milk
Seminal fluids
Urine
Aerosolization (reported in kennel and laboratory settings)
Fomite transmission under certain conditions
brucellosis pathophysiology
Organism is taken up by reticuloendothelial system
Remains intracellular and travels to lymph nodes, spleen, and liver
Bacteremia occurs 1-4 weeks after exposure
Typically wanes after 3-4 months but can persist up to 18 months
May wax and wane for years
Modes of transmission include reproductive tissues:
Testicles
Prostate
Epididymis
Uterus
Placenta
brucellosis clinical signs
Infertility
Abortion (typically late term, 45-55 days, but can occur at any stage)
Stillbirth
Placentitis
Metritis (females)
Epididymitis (males)
Prostatitis (males)
Orchitis (males)
Disease may remain subclinical for years in:
Individuals with no reproductive activity
Spayed or neutered animal
brucellosis non-reproductive manifestations
Can cause Ocular/MS abnormalities
brucellosis diagnosis
Gold standard:
Demonstration of B. canis through culture or PCR assay
Sample sources include reproductive tissues, aborted materials, vaginal secretions, semen, milk, and blood
Challenges with direct detection:
Biosafety concerns (zoonotic potential)
Potential false negatives due to intermittent bacteremia,
Serological testing methods:
Often used in conjunction with culture or PCR for diagnosis, screening, and surveillance
brucellosis treatment
No treatment is completely effective at eliminating B. canis infection
Euthanasia often recommended due to zoonotic potential
If euthanasia declined
Treatment and monitoring are lifelong
Neutering is required
Antimicrobial treatment for minimum of 2-3 months
Isolation requirements (vary by state)
Regulatory considerations
B. canis infection is not nationally reportable in US
Reportable in many states
Treatment recommendations often made by state/local authorities
brucella canis client education
Zoonotic potential:
B. canis is transmissible to humans through direct contac
Endemic in certain parts of the world
Infection in dogs likely underrecognized and underreported
Complete elimination of infection is unlikely
Treatment is expensive and requires long-term commitment
Importance of proper PPE and cleaning protocols
Isolation requirements for infected animals
Discussion of household risk factors, especially for immunocompromise individuals
Infected animals should not be used for breeding
brucellosis nursing note
Nursing Note: Brucellosis Precautions
When handling suspected canine brucellosis cases, staff must wear appropriate PPE as this is a zoonotic disease transmissible through contact with reproductive tissues, blood, and other body fluids. Isolate and label all infectious materials as biohazards, disinfect surfaces thoroughly, and house suspected cases in appropriate areas with restricted access and dedicated equipment while ensuring staff promptly report any potential exposures. ;p