Here are safety tips from Best Friends Animal Society:
"Too much rich, fatty food, or simply new, unfamiliar foods can upset a pet’s stomach--and even cause pancreatitis, which can be life-threatening—so owners should go easy on the tidbits. Poultry or ham bones can break up or splinter in a pet’s stomach and be deadly, so dogs and cats should never be allowed to gnaw on them, and bones should go outside to the trash immediately. Other food-flavored items like plastic wrap, string, mesh or the pop-up timer can smell tempting to curious pets, but can injure their stomachs if stolen and ingested.
Chocolate, especially that used for baking, is toxic for dogs, so it should be kept out of reach. Other common food items that can be poisonous to dogs include onions, raisins and grapes, so avoid sharing these.
It’s a good idea to review these rules with any guests as well, since well-meaning holiday visitors might not know the potential harm caused by slipping treats to the pets under the table. If pet owners want to make the holiday special for their four-footed family members, they should plan ahead and have safe, delicious dog and cat treats on hand, like canned pet food or a tasty pet treats or fun toy. There are also many great recipes online for homemade dog and cat treats that are fun to make and extra special for our pets.
A final note to consider is that many common decorative plants and flowers can be toxic for curious cats and dogs, so before buying plants or creating the centerpiece, it’s wise to check to ensure that you’re not using anything that could poison your pets. According to the AVMA, some plant hazards include amaryllis, baby’s breath, sweet William, some ferns, hydrangeas and others."