I have two shi tzu's, they are 8 months old. They have a pet door and use it to go outside, but I'm still finding a mess in the house, they or one of them keeps peeing in the house. We have no carpet, cork and tile floors, what is up???? They know how to go outside!!!
No medical problems, they have regular check ups.
Have a vet check for medical problems and if there are none, start housebreaking 101 all over again. Occasionally puppies (especially toy breeds) fall back into bad habits and need a refresher course. It's not that uncommon.
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