Some puppies get so excited at playtime or when people come through the door that they urinate on the floor. So keep a supply of pet stain removal products on hand.  Even well trained dogs can exhibit this behavior. As your puppy grows and gains more confidence, the problem with  overactive urination usually goes away.  Unless you accidentally reinforce the behavior. If your dog has accidents when you walk through the door and your veterinarian has ruled out any medical causes for this problem, do not scold your pup for his behavior but don’t reward him for it either.  If you console your dog after he pees on the floor, you are sending a message that his action is acceptable. Instead be “low key” about it and ignore your dog’s excitement and wait until he’s calm to pet him.