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Grapes and raisins can cause kidney failure in dogs, and sometimes a raisin can kill dogs. Macadamia nuts, walnuts and macadamia nuts can cause collapse, muscle spasm and paralysis. Other nuts are bad for dogs and should be avoided, because they are high in phosphorus and may lead to kidney calculi. Peanut butter is an exception, but for peanut butter, organic sugar-free peanut butter should be used. Avocados themselves, seeds and fruit trees are poisonous. It can lead to dyspnea and hydrops in the chest, abdomen and heart. According to some theories, avocado oil is good for dogs. Seeds and nuts of apples, cherries, pears, apples, cherries, pears and similar fruits all contain cyanide, which may be fatal to people and dogs. Cyanide can also be found in the intestines of dogs and can kill them without warning within 24 hours.