Dr. Michael Salkin is typing. Please be patient.
Thankfully, Shadow will remain safe. I don't consider grape toxicity (kidney damage) unless at least 0.35 grapes per pound of body weight (5 grapes for Shadow) had been ingested. There's no need to induce emesis nor treat in any manner. You can feed and water as usual.
Please respond with additional questions and concerns if you wish.
You're quite welcome.
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