What is the size of a rat pup? The breeder i got mine from said feed he rat pups. I got a rat pup and a few mice. My two that haven't eaten since i got them finally ate a mouse. It just seem like that rat pup might be too big. She is 200 and something grams. She might just not be used to me here yet since i just got her and is stalling on eating. I just got to keep rat pup till next weekend.