If your dog is experiencing tooth, gum, or any other mouth related soreness, he or she may also stop eating to avoid the pain. This type of problem can result from an accident such as a dog chewing on a sharp object (think broken sticks or a jagged bone). It might also be something more serious related to poor dental hygiene and disease that will need further treatment.
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There are a wide variety of treats you can buy for your dog. Be aware that these can vary in quality and could contain a lot of sugar, milk products and fat, so always check the ingredients.