Plain canned pumpkin (not pie filling) can be given in these amounts: Small dogs (up to 20 pounds): Start with about 1 teaspoon to 1 tablespoon per day. Medium dogs (20 to 50 pounds): Start with about 1 to 2 tablespoons per day. Large dogs (50 pounds and above): Start with about 2 to 5 tablespoons per day.