Cardiomyopathy: A disease or disorder of the heart muscle, especially of unknown or obscure cause.

Carnivore: A flesh-eating animal.

Carpals: Bones of the wrist.

Carrier: A dog who, though not showing any indication of being affected, carries a genetic defect or disease-causing organism that can be passed to other animals.

Castrate: To remove the testicles of a male dog.

Cataract: Opacity of the lens or capsule of the eye, causing impairment of vision or blindness

Cat Foot: Neat, round foot, with high-arched toes held closely together.

Caucasian Ovtcharka: A large, strong breed originating in Caucasia and bred to protect livestock.

Cavalier King Charles Spaniel: An English toy spaniel with a curly, black and tan coat and long ears