Cataract, lens opacity
Cavities of teeth, tooth pitting
Change in voice, vocal strength
Chemosis, conjunctival, scleral edema, swelling
Circling
Claw, hoof separation at white line
Cleft palate or lip
Cold mammary gland, cool udder
Cold skin, cool ears, extremities
Colic, abdominal pain
Coma, stupor
Congestion oral mucous membranes, erythema, redness oral mucosa
Conjunctival, scleral, injection, abnormal vasculature
Conjunctival, scleral, laceration, cut, tear, injury
Conjunctival, scleral, papules
Conjunctival, scleral, redness
Constant or increased vocalization
Contracture fore limb, leg
Contracture hind limb, leg
Contracture of limbs, legs, foot, feet in birds
Contracture of the toes of birds, curly toe
Contracture, curvature, wings
Cool nail, claw, hoof, cold
Corneal edema, opacity
Corneal injury, cut, tear
Corneal neovascularization, pannus
Corneal or ocular foreign body, eye
Corneal swelling, mass, nodule, plaque
Corneal ulcer, erosion
Coughing, coughs
Cracked beak
Cracked skin, fissure
Cracked tooth, fractured teeth
Crepitus bladder
Crepitus, uterus, vagina, cervix
Cut tear injury penis
Cut tear injury prepuce
Cut tear injury, scrotum, testes
Cyanosis, blue skin or membranes