At just over 3 months (13 weeks), Ninja was only 12 pounds. She is a small girl as it is, but was a bit slow in her growth at first, thanks to some run-ins with UTI's and giardia. I haven't taken her to the vet for a weigh-in for about a month and a half, but last time there she was 38 pounds. I bet she's cracked 40lbs by now...she's almost 10 months old.