This is another well-loved addition to the Thanksgiving table, but it shouldn’t be dealt out to the dog. While potatoes are fine when consumed by dogs in moderation, the ingredients in mashed potatoes are not so great for them.
Many dogs are actually lactose intolerant, so the milk, butter, and cheese in mashed potatoes would likely not agree with them. This could result in an upset stomach, diarrhea, or even vomiting. The flavorings are also something to watch out for, as they could include garlic, onion, or something similar.