Finn did the yo-yo weight dance between 6 months and 2 years; every time we turned around he was five pounds different in either direction. As long as they look right the way qbchottu explained, then you are fine. Whatever trainer told you that she was done growing by now is silly, IMHO. The first time there was no change in height/lenght with Finn was noticed at his 2 1/2 year vet appt. He grew another inch in either direction by 3 1/2, but he was pretty much done growing after 2 1/2 years.