Chester didn't start lifting his leg until he was a little over a year. I have actually heard that most male dogs do this, I think it might be a balance thing, you know how clumsy puppies are, I'm sure that if he is attempting it now he will be a pro soon just like Chester, I swear he holds his pee all day long so when we go for long walks he can pee all over everything that is standing. Don't know how he holds so much