We put Ty in school when he was 10weeks old.......and I will say that yorkies are teahers pet, his teacher loved him and she used to have to catch herself paying more attention to him then the others. Like I said Ty was 10 weeks old and learned sit right away he was in the class with a grat dane, a boston, a couple of hurding dogs and he TY was one of a kind...........people would stop in the middle of the store and look in the class and not to brag, but you will soon find out they all stopped to look at the yorkie.......they are veyr smart and very social,Ty is 5months and still remebers most eveyrthing.....you will have fun, we are signing him up for the next class cause he loved it..................keep us up to date..........