I have a fairly small ferret, how can I make her fatter/bigger?
you probably cant. dont be scared or anything she looks like my old ferret. its a female right? most females are small. she's fine, they dont need to be over weight it causes them health problems.
I had a small ferret, she was tiny, naturally. their matabalism is naturally extremely high so dont worry about it.
I'd advise you not to make her bigger she could start having joint problems.
Females might be smaller than male ones, keep that in mind. How old is the ferret? It may just be a runt(not grow much). Whatever you do, don't over-feed it! Make sure it has plenty of healthy foods and gets exercise outside the cage.
Most likely you aren't going to be able to make your ferret bigger.
As for the answer above mine, ferrets don't overeat so feel free to provide food 24/7