If you have a dog that barks excessively, you may wonder just how long it can go. Believe it or not, some pets can make noise for days on end. It depends on the breed, the size of your dog, and the reasons behind the behavior. If your dog does bark for a need, you need to address that concern. Take care of your pet's health and safety, as you are its caretaker. If your dog only wants to bark for the fun of it, try your hardest to ignore it or train it with the "quiet" command.