Instructions
Take your dog to the vet and have him neutered. Most veterinarians agree that this will stop a large percentage of marking and spraying issues. The younger the dog, the better the chance of success. If neutering does not stop the behavior or if neutering is not an option, you will need to rely on other methods.
Use a crate to curb the unwanted behavior. A crate is a good option because a dog will not urinate in his den and on himself. When you catch your dog getting ready to spray, clap your hands sharply and say, "No." Take him to the crate and put him inside until his excitement wanes and the urge to mark subsides. Then take him outdoors to urinate. Make sure you praise him when he does urinate outdoors.
Put a doggy diaper on your dog to teach him to associate spraying with an unpleasant sensation. The doggy diaper is a pad that goes around a dog's abdomen. When he attempts to spray, the urine will land on the pad, resulting in an uncomfortable sensation. Leave the pad on for about 10 minutes after your dog sprays, then remove it and take him outside to urinate. Keep putting on new diapers to reinforce the lesson.
How to Stop My Male Dog From Marking When Excited
Dogs mark for a variety of reasons. The usual impulse to mark is that the male dog wants to lay claim to his territory. Other reasons a male dog may spray include separation anxiety and stimulation of hormones. In any case, such marking is clearly inappropriate indoors. Your dog should not mark whenever and wherever he pleases outdoors, either. There are steps you can take to discourage a male dog from marking when excited.