Has your dog been hiding, not eating or moping around? Is his tail limp? Does he seem consumed by ennui? Your dog could be depressed. Dogs can become depressed just like humans can, and baffled owners may not know what to do when their furry pals suddenly stop showing their usual cheer and happiness. Thankfully, certified animal behavior consultant Darlene Arden is here to help. We asked Arden all about depression in dogs, how to recognize it when you see it and what to do about it.