Ever since I got Shilo, he's been tiny and skinny. The breeder I got him from had gotten him back from a return (Someone thought he was a super, not due to false advertising, he was really really bright as a hatchling) and I bought Salem from him. Salem was plump, healthy, and Shilo was somewhat small and skinny. Even with the feeding records, he was thin. I've been keeping a record of his feedings, and he keeps getting longer, but not quite thick enough. I don't know if this is just the way he is, or if I should feed him more. The next step up is small rats, but that's a huge step considering large mice stretch his neck and head but not his belly. I really don't want him to be hurt if I upgrade him to a rat. I can't find any stores that sell rat pups, just go from a large mouse to a small rat.

Any suggestions or am I doin ok?