Boomer's puppy kindergarten teacher highly suggests that when a puppy is not in their crate or out playing that they be on a leash held by their human until they have the potty training down. I was skeptical, but it really has seemed to work on Boomer. He bounds for the door when he has to go out, and since he is on the leash, I know when he wants out. The few accidents he has had since we've been doing this have been because the leash wasn't being held.....and usually these were right by the door....we just didn't know he needed to go out. He is a typical little boy in that I think he waits until it is almost an emergency before he decides he needs to go out! Also, the maturity factor is a BIG reason he is doing better, too. Coco will get it!! I know he is a smart little pup!!