Female Shi Tzu that pees on my rugs
Luli is 7 years old, she is spayed, and has been trained to pee outside in the patio on puppy pads. She lets me know when she wants to go by scratching the glass door of the patio, and I always take her out before we go to bed. She has always had periods of stress where she would pee on carpets and rugs, but now she started peeing on my bedroom rug, and she does it while I am sleeping. There is no way for me to catch her in the act and I don't know what else to do to make her stop. Please help me... :)