A similar thing happened at the hospital I work at. A 13 year old bichon was brought in by the family's housekeeper; she was watching the dog while they were out of town. She brought him in because his head was bleeding and she thought this small cyst he had on his head had ruptured. We shaved the hair to look at the wound more closely and ended up finding multiple puncture wounds and lacerations all over the dogs head. She had taken the dog to her house, like she had other times she had watched the dog, where she had her two large dogs (not sure of the breeds). They'd never had problems before, but obviously something had happened this time. We think the little dog must have been hiding under a couch/bed/chair/etc and stuck his head out and one or both of the larger dogs mistook him for a toy. We think this because, while his head had sustained quite an attack, everything below the neck was completely unscathed. The doctor stitched up a few of the wounds, but many of the punctures had to be left open. One of the dogs ears was detached from the scalp and the dog was in respiratory distress. She was barely responsive and very mentally inappropriate. After the shaving, bruising, and swelling, she barely looked like any creature from this planet. I felt so bad for the little girl. We kept her in oxygen overnight because the family wanted to see her and talk to the doctor when they came home the next day. Thankfully, for the sake of the dog, they decided to euthanize after seeing her. Despite everything we were doing for her, she was getting worse and anything we would continue to do would only have been delaying the inevitable. It gets hard seeing this kind of thing over and over again in the ER/ICU, but the success stories make it all worth it.