I am adopting a 3 month old Shih Tzu female puppy today from a rescue organization, she is one of the many dogs rescued from the puppymill bust in Jackson County, Georgia where the “breeder” is facing several animal cruelty charges. I have a 9 month old male Havaton, Grady (Havanese/Coton de Tulear) who is wonderful, sleeps through the night, was potty trained in four months and is excited about getting a new sister! But I understand Shih Tzu are typically pretty difficult to housebreak. Also, she was fixed 3 days ago so she’s probably going to be pretty sore. When is it okay to let her play with Grady?