why are guinea pigs harmless
1 Chirodiscoides Caviae is a relatively harmless fur mite that only lives on guinea pigs. 2  Cheyletiella Parasitivorax is an extremely irritating fur mite that can infest dogs, cats, and other animals and cause dermatitis in humans.heyletiella parasitivorax, rabbit fur mites, live on the karatin layer of the skin. These large, non-burrowing mites can be found on cats, dogs, rabbits, guinea pigs, and other animals and can bite, but do not live on humans (cause small reddened, itchy spots). About .3 mm long, they are a pale yellow to white mite.