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Erythrocytes (RBCs)
small and round
presence indicates bleeding somewhere in the urinary tract but 2-3 per hpf is normal

Leukocytes (WBCs)
larger than RBCs
dull gray-greenish yellow
pyuria - excessive WBCs in urine
Squamous epithelial cells
distal urethra, vagina, vulva, or prepuce
not significant
flat, thin

Transitional epithelial cells
bladders, ureters, renal pelvis, and proximal urethra
round but occasionally pear shaped, smaller than squamous
small granular nucleus

Hyaline cast
Clear and colorless
composed of mostly protein
cylinder shaped with rounded ends

Granular casts
hyaline cast with granules
acute nephritis

Epithelial cast
epithelial cells from renal tubules embedded in hyaline matrix

Waxy casts
wider with square ends, dull waxy appearance

Struvite / triple phosphate
Found in alkaline to slightly acidic urine
8 sided prism with tapered ends, looks rectangular kinda like a coffin lid

Calcium oxalate
dihydrate looks like envelope with X on it. Acidic to neutral urine
Monohydrate is bad looks like a dumbbell or pointed at each end, indicates ethylene glycol poisoning

Uric acid
diamond or rhomboid most common shape
yellow or yellow-brown
not common except in dalmatians

Amorphous crystaline material
common in alkaline urine

Calcium carbonate
round with lines radiating from center or large granular masses or dumbbell shaped
Common in rabbits and horses

Cystine
flat, colorless, 6 sided

parasites that can be in the urinary tract
bladder worn (pearsonema plica
Giant kidney worm of dog (dioctophyme renale)
Dirofliaria immitis (heartworms)