10 Animals Used In Animal TestingMice and Rats. Let\\'s start with the most common animal used, comprising 93% of all laboratory animals. Guinea Pigs and Hamsters. Still in the rodent family like mice and rats, guinea pigs and hamsters are extensively used as well.Rabbits. Birds. Fish. Dogs. Cats. Chimpanzees. Macaques. Pigs, Cows, and Other Farmed Animals.