According to the American Society for the Prevention of Cruelty to Animals, holly berries are toxic to dogs, cats and horses, with a low toxicity. Holly leaves are also toxic. More »

Plants that are poisonous to dogs include American holly, amaryllis, castor bean plants, garlic and other members of the allium family, and tomato plants, says the American Society for the Prevention of Cruelty to Animal... More »

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Some types of ferns are poisonous to dogs. According to Vet Street, the most common threat comes from asparagus ferns, which contain sapogenin. Dogs that eat the berries of this plant are likely to undergo abdominal dist... More »

According to the ASPCA, eucalyptus is toxic to dogs as well as to cats and horses. The dangerous component is the oil of the plant. Dogs that ingest toxic amounts of eucalyptus exhibit symptoms that include salivation, v... More »

According to the ASPCA and the Pet Poison Helpline, poinsettias are rarely poisonous to dogs, and their toxicity is often overrated. The Pet Poison Helpline says that poinsettias may cause vomiting and drooling in dogs a... More »

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Raw rowan berries are toxic to dogs due to high concentrations of parasorbic acid. The raw berries are also toxic to humans, but humans can eat cooked rowan berries. More »

According to the American Society for the Prevention of Cruelty to Animals, the hibiscus plant is toxic to dogs, cats and horses. When consumed, the plant can cause vomiting, diarrhea and even nausea. More »