Feline Distemper ---------------- Researchers claim that ferrets are not susceptible to feline distemper. There are, however, reliable reports to the contrary. Consequently, the decision to vaccinate ferrets against this disease is an option for each ferret owner. However, if an individual ferret is likely to have substantial contact with cats (especially those of unknown or uncertain health status), vaccination of the ferret against feline distemper is a wise idea. The vaccine itself cannot harm the animal, and it represents insurance. The vaccination schedule for feline distemper is the same as for canine distemper. Most veterinarians administer a combination canine distemper-feline distemper vaccine.