My dog is about 7-8 months old. I keep finding blood on her pillow every morning. I have no idea what is wrong with her but I never find blood on her. I am a very first time dog owner so I have no clue what's going on. My little brother thinks she could be loosing baby teeth but I have not seen any. I wondered if it could be a period? But then again it seems to be only at night. Any ideas?