The dietary requirements of ferrets can easily be satisfied by feeding commercial cat food. The growth formulas for brand-name cat foods, composed of high-quality meat (not plant) protein are preferred (for example, Iams or Science Diet). Dry kibble is recommended over semi-moist and canned foods because the soft foods lead to disease of the gums and tooth roots.
Table food also can be offered but should be limited to cooked meat, fish and poultry. Fruits and vegetables may be offered in very limited quantities. Do not feed milk and foods rich in sugars (cookies, candy) and carbohydrates (pasta, rice, bread) because ferrets have great difficulty digesting these foods. Bones and foods containing bones should not be offered because they are likely to injure the ferret's digestive tract.
It is not necessary to offer vitamins or vitamin-mineral supplements to your ferret as long as it is fed as outlined above. Your veterinarian may recommend these dietary supplements, however, under special circumstances or for aged ferrets. Fresh, cleanwater should be available at all times. Water bottles or heavy ceramic (crock) dishes can be used for this purpose.