1.4 Parasitic skin disease

Where and when is trombiculiasis typically found on an animal?

• Cats + dogs = between toes or inside pinna

• Horse = face (grazing)

• Autumn (autumn mites)

Cat, dog and rabbit cheyletiellosis species and treatment

• Cat = C. blakei

  • Fipronil (NOT RABBIT), macrolacs, FASL

• Dog = C. yasurgi

  • Fipronil (NOT RABBIT), macrolacs, FASL

• Rabbit = C. parasitivorax

  • Macrolac (ivermectin)

Cheyletiellosis on human (zoonotic)

• breakfast, lunch, dinner

2 common demodex species in cats and dogs

Dogs

• D. canis

• D. injai

Cats

• D. cati

• D. gatoi

3 types of canine demodicosis, lesions and reason

• Localised juvenile onset

  • 3-8 months

  • Temporary insufficient immune competence

• Generalised juvenile onset

  • 3-8 months

  • Worsening of localised juvenile onset

• Localised/generalised adult onset

  • >2 months of age

  • Immunosuppression in adulthood (since no juvenile onset)

How do you define canine demodicosis treatment as successful?

2 negative skin scrapes 14+ days apart

How does demodectic mange often present in a dog?

Comedomes + inflammatory hyperpigmentation

• Secondary bacterial infection

Where is the best place to sample for sarcoptes?

Ear flaps = dogs cannot self traumatise the area

Areas affected by flea bite hypersensitivity

Typically mid-caudal dorsum, tail, caudal (+ medial) thighs

Flea bite hypersensitivity age of onset

3-5 years old

Flea bite lesion presentation

Crusted papules

3 signs of cat flea bite hypersensitivity

• Miliary dermatitis along dorsum/tail

• Overgrooming → self traumatic alopecia on abdomen and hindquarters

• Eosinophilc granulomas (philip clark complex)