Bella, our 9 month old malti-poo, was chasing our other dog around the living room the other day when she jumped off the couch into the coffee table and gave herself a concussion. If you have never seen a dog with a concussion, it isn't a fun sight. There's nothing like being up until midnight because the dog is vomiting every 20 minutes and salivating/drooling all over every thing. It took her two days before she would eat, and then, only a couple of goldfish at a time. We knew she was recovering when she started barking again.