We have 2 brothers that are right at 5 months old we have had since they were 6 weeks old. I wanted another Mtn. Feist. My wife rescued these two from a pet store that should be closed. They were about dead from worms when we picked them up and took them to the vet. Anyway these dogs are the hardest to house train of any dog I have ever seen. Take them out every hour and they will still urinate in their play pin or any were they decide. We have tried everything that we have done in the past for the other dogs that we have had and nothing works. Clean bill of health from the vet, no urinary infections. Any Ideas?