If you dog is looking all depressed and sad, and whining and moping, it could be he or she is having a hard time coping with this time of year. It's back-to-school for kids and dogs have lost their playmates. Many of the nations 80 million dogs have separation anxiety when their best friends go back to school. Some bark, howl or whine. Others destroy things or have accidents. Click here for what to do with your dog if he is suffering.