Q. My little dog ate 1 grape. It has been 3 hours now and he hasn't thrown up or anything. Will he be fine?
DR. MASSIMO ORIOLES, DVM, MRCVS
A. Grape toxicity is focused on the kidneys, resulting in potential acute kidney failure.
Unfortunately the toxic effect is not directly related to the dosage, so even one single grape might lead to toxic effects.
Monitor for signs such as vomiting and diarrhea, inappetence, lethargy, and oliguria or anuria (production of small volume or complete cessation of urine).
I would recommend to take him to your veterinarian to discuss what can be done. Your veterinarian may suggest to make him sick or give activated charcoal that may be useful for preventing absorption of toxin as a first treatment. Further test as blood test and fluid therapy may be needed.