Female ferrets in heat can be taken out of heat within about 3 weeks by injection of a specific hormone after the first 10 days of heat. 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. The vaccination schedule for feline distemper is the same as for canine distemper.
Most veterinarians administer a combination canine distemper-feline distemper vaccine.
Rabies Ferrets are assumed to be highly susceptible to rabies and capable of transmitting the virus. A killed rabies vaccine should be given annually, starting at 3 months of age. There are now rabies vaccines approved for use in ferrets. Some of these ferrets tested positive for feline leukemia virus, while others tested negative. Cancer can be one possible result of such an infection.