I have never heard of this before. Though this is the first dog that I have had. My others were bitches.
He has just cocked his leg on dd1. Why would he do that?
Toilet training is otherwise fine. He has never done this before. He has never showed any signs of agression.
Should I be worried about this? He is going in for neutering later this week, but I understand that it takes a few months for the hormones to go.