My 8 month old labrador has recently started peeing in the house, even though he previously knew he had to go outside to do this. Not spraying but proper pees. If I'm out and about with him, he does his no.1 and 2's no problem, but if I let him in the garden he will not do anything, until he's back inside. I'm not sure if this has anything to do with it but he has not been neutered yet.