I know this is an older thread, but if I just came across it then there are probably many more that google and come across it as well. A few years back I had 2 dogs poisoned by someone, one of the first questions the SPCA asked me was if my dogs had been given, or had access to, grapes. This was before the toxicology report was done on them, where we later found out they were given a large dose of Lorazepam. Anyway, it was the first time that I had been informed that grapes and raisins (which contain the seeds), or rather, the grape seeds were poisonous to dogs. As another note..it's not just the avocado seed that is poisonous to a dog, the avocado including any part of the plant can be poisonous. It contains Persin and is in the leaves, seed, and bark, as well as in the fruit.
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