my sister was just telling me she feeds her ferret peanut better and fruit and milk cuz her vet said it was a good way to fatten them up where they had been abused and were very skinny. that doesnt sound good for them at all is the vet a total crack head?
That is absolutely terrible advice. Ferrets are very strict carnivores. Unfortunately, exotic medicine is a specialty field and many vets who "see" ferrets are also not terribly knowledgeable about them.