Are Apple Trees Bad For Dogs?

Are Apple Trees Bad For Dogs? However, some species of fruit trees, particularly apple/crabapple, apricot, cherry, peach, and plum can be toxic to dogs, cats, and horses. Are any trees poisonous to dogs? Horse Chestnut (Buckeye): This tree contains saponin, which causes vomiting and diarrhea, dilated pupils, affects the central nervous system, and can also