Neutering WILL help him!! The peeing in the house...........I cant think of much because I dont have a male just a female.....but I would take him into the vet and get him checked out for a UTI!! Just to be on the safe side. Also around this age my girl went through a stage when she peed when she got excited and never even noticed it! She did grow out of it! Im sorry Im not much help but dont give up on him! Hes still a puppy!