Veterinary questions? Ask a Vet for Answers ASAP
You are through to Dr Coles, I am a UK based Vet. Grapes are toxic to dogs even in small amounts. Unfortunately, there is no set amount which can cause toxicity. Maltese dogs are very small and her weight is very low and so one grape could be very significant. Grapes can cause acute renal failure which usually does not show symptoms for a number of days. It would be best to phone your vet tonight so that they can induce vomiting with an injection. Otherwise, if left we cannot guarantee that she will be OK and it is not worth the risk. This is urgent so I would phone your out of hours vet now. I hope you are able to get her to the vets quickly and get her sorted.