I have a 7 month old shih tzu who just went into heat for the first time about a week ago. Around the time she first went into heat, we found a pee spot on the couch. Since then, she's urinated on the bed twice, and once on another family member. She's been completely paper trained for months and even before she was, she never peed on the couch and especially not on a person. Does anyone know if it is possibly because she went into heat? Or is this something I need to talk to the vet about? We thought maybe it was a phase because of her age but we flipped through the books we have and none of them mention anything about it. I mainly want to make sure it's nothing we should really worry about. I would really appreciate anyone's opinion. PS: I thought it might be because she was unhappy but nothing has changed in our home life. I stay at home and my husband is home from work every night. My step-daughter is here every other week for her to play with.