Homemade gravy is often made with the fatty drippings left over from your turkey. Just like with turkey skin, the high fat content can cause gastrointestinal distress and life threatening inflammation. Aside from gravy, you should keep your dog away from any other dishes that are high in fat, such as mashed potatoes with butter.
Garlic and Onions
Garlic and onions are commonly used aromatics during the holiday season. They add depth of flavor to many dishes, but will damage red blood cells in dogs, which leads to anemia. Common symptoms are vomiting and diarrhea, weakness, and pale gums. The symptoms may take a while to show up, so your pet may seem fine for a few days before suddenly becoming weak.