I've heard of females being large enough at 1 year, but I think it's usually closer to two (maybe more depending on size). My female was big enough to breed at about 1.5 but breeding season didn't happen till she was closer to 2. Of course, then she got sick so breeding season didn't happen at all this year. Though her and her future boyfriend immediately tried to lock up when I let her see him for about five minutes the other day so who knows...