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More than 100 plants are poisonous to cats, including aloe vera, candelabra, daffodil, eucalyptus and Morning Glory, according to the Cat Fanciers' Association and PetMD. Cats can have varying reactions to poisonous plants from mild stomach upset to life-threatening sym...


Many human foods are toxic to dogs, including chocolate, grapes and onions. Many candies and other sweet foods are dangerous because they contain xylitol, an artificial sweetener that is highly toxic to dogs.


All varieties of apple and cherry trees are toxic to dogs, particularly the leaves. Hawthorn trees, which are closely related to apple trees, are also dangerous for dogs prone to chewing on plants and foliage.


Toxic flowers include wisteria, hydrangea, foxglove and lily-of-the-valley. Every part of the oleander is toxic, and poisonous berries grow on mistletoe and nightshade plants. Moonseed, which produces berries that appear similar to grapes, are also toxic. Yew, cherry an...


The ASPCA educates that grapes and raisins are fruits that are toxic to dogs. Avocado and moldy fruits can also be toxic to dogs. The website DogHeirs says that particular types of fruit seeds and pits are toxic to dogs as well.


Although dogs are omnivores, garlic, onions, chocolate and grapes are highly toxic to them. Fruit seeds and pits in general should be avoided; those that are not toxic often present choking hazards to canines. Nuts, mold and alcohol are very dangerous to dogs as well.


Hibiscus plants are toxic to dogs, according to the American Society for the Prevention of Cruelty to Animals. Hibiscus plants can cause vomiting, nausea, anorexia and diarrhea. Hibiscus is also toxic to cats and horses.