You should never try to diagnose any type of health problem in your Shih Tzu on your own. If you are concerned for your dog’s health and suspect something isn’t right, please call your vet and schedule an exam right away. If your Shih Tzu has extremely bad breath than gingivitis or gum disease could be the reason; however, it is best to let your vet test and determine this on his own. Gingivitis involves inflammation, redness and swelling of the gums due to the build-up of plaque, which is food or other debris. Your vet will need to perform a physical exam on your dog and will most likely ask you for a detailed history of your dog’s overall health. Tell your professional veterinarians Lakeville, MN what type of food and treats your dog treats can also help in making a diagnosis and prescribing treatment.