Bad breath (that which is out of the ordinary for your dog), yellowing or crust at the gum line, swelling, or pain when you touch your dog’s gums should be noted. These could be signs of infection and should be addressed immediately. Dogs bad breath is not fun for anyone. And dog breath, like in humans, often means disease. Bad breath, bleeding and inflammation of the gums, receding gums, loosening and the eventual loss of teeth are characteristic of the condition. You should regularly providing some form of dog dental care and if not you are neglecting an important factor in their overall health.