So, we had two old dogs that we adopted 3 years ago. They were about 9 years old when we adopted them, and they are 12 now. We adopted them as sisters, they came from the same litter. One of them recently died due to a tumor that was on her leg that just couldn't stop growing. The sister that is still living is super depressed. She was usually joyful and playful. She hasn't come out of my parents room for two days, except for the one time when she went outside to go pee. But she usually wants me to stay outside with her and pet her in the grass. She didn't want that, after she did her business she went straight to the door slowly. She just has been sleeping in my parents bedroom with her head between the mattress and the floor. She has even been having nightmares and been crying in her sleep. Whoever said animals cannot feel emotions is completely wrong. I have been trying to give her attention but nothing is working. Any ideas? I haven't been able to get this off of my mind and my school work and sleep has been suffering.