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I looked for answers to your question on the web, and three answers I read so far are positive. (Bottomline, everythin in moderation, and make sure the grapes are not full of pesticide) Here they are:
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yes, they can. just don't give 2 many @ once. they can get diarrhea. don't overdo it
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Copyright © 2017 HubPages Inc. and respective owners.