Excitement urination usually occurs in puppies and is caused by lack of bladder control. The dog is not aware that he is urinating, and any punishment will only confuse him. Since he does not know why you are angry, the excitement urination will quickly become submissive urination in an attempt to appease you. As your puppy matures and develops bladder control, the problem will usually disappear. However, in the mean time, it is probably a good idea to do something to help keep your puppy dry.
The best treatment for excitement urination is to prevent your dog from becoming overly excited in the first place. You can do this by exposing your dog to the stimulus that excites him, over and over until it no longer excites him. Most likely, your dog gets excited and wets when you return home. If so, simply ignore him for about 10 minutes. Don't even look at him.
Then leave again for a few minutes, return and ignore, leave, return and ignore. Keep doing this until you can see that your dog is not only unexcited, but is actually getting bored with the whole thing. If your dog gets overly excited when visitors arrive, have them do this too. When your dog has calmed down and is no longer excited when you come in, then very quietly and gently say hello. If any signs of excitement appear, quickly exit and repeat the coming-and-going routine. A rapid sequence of heel-sits will capture your dog's attention and channel his excitement to the game of heeling and sitting. Remember to ignore all excitement urination and never scold or get angry at your dog when it occurs.
Check here or information on Housetraining a Young Puppy.
Check here for training tips for new puppy owners.
Check here for information on Housetraining the adult dog.