If you wait too long to get him neutered he still may lift his leg when he pee's and he may still mark. My sister's dog Mickey is neutered (Vet told her it would stop him from peeing when he gets excited or scared) she waited til he was about 2 yrs and he still lifts his leg and marks everywhere he goes when he's outside and he still pees when he gets excited or scared
.
Choppi was starting to lift his leg and "marking" and was getting agressive with our other dogs and so we got him neutered in July he was just about a week or so shy of being a yr old. And now he no longer marks or lift his legs.
He does the cute squat thing.
Hope that helps....