The age when a dog should be potty trained varies by breed and size, but most dogs can be fully potty trained by the time they are about nine months to a year old. Note that “fully potty trained” means no accidents at all unless the dog is sick or asked to hold it for too long. A dog who is still having occasional accidents is not fully potty trained yet! Most puppies can make a lot of progress in potty training before they are nine months old, but a variety of factors can make it hard for them to avoid an accident here and there. If you manage your puppy very well and follow all the guidelines above, though, you can get your puppy to the point where there are almost no accidents very quickly!