My past rabbit that passed away a month ago was always assumed to be a male. We got him from a small local pet shop about 10 years ago at 6 months old. The pet store just assumed so his whole life he was a he but... one day I picked him up and he had nipples that you could feel and they were visible in a picture from a few years ago (about 5-7 years ago) I will link the picture in here. Since he had nipples does that mean he was a definite girl? He also had a dewlap which I know is more common in females. darker spots are nipples I'm assuming but I felt them before and they were for sure nipples.