Correct!
The answer is: Unknown at this time
The type of grape or raisin doesn't seem to matter, and the amount consumed may be a single serving of raisins or a pound or more of grapes. (Raisins are much more concentrated.) Researchers are exploring the possibilities: a mycotoxin (fungal toxin), pesticide, herbicide or heavy metals, but thus far the actual toxin is unknown at this time.
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FAQ:
Are grapes and raisins really poisonous to pets?
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