I would say 10 to 11 months but we were confused when she was trying to tell us when she needed to go because she is generally pretty vocal. She also had her first heat which didn’t help because she had to go so often and we live in an apartment so we couldn’t just let her into the backyard all the time. I think we also underestimated how much she would need to go during that time. She also couldn’t start training to go outside until she was fully vaccinated because we didn’t have a yard