I wouldn't worry too much. Puppies have accidents. Once when Ozzy was about 6 months old, he'd had a bunch of water right before bed. We were tired from hiking and didn't realize it, but I woke up to him peeing in his sleep! :( poor puppy! He looked so confused and had to give him a midnight bath. :O sometimes we humans make mistakes and sometimes puppies have accidents. Just because Shibas are usually clean doesn't mean puppies are accident proof. :)