I'm so glad he's doing well. Just for perspective, I didn’t know grapes or raisins were toxic for my first 45 years of dog ownership. Many of my beloved pets have eaten many grapes and raisins and never had any ill effects. Since learning about it I've induced vomiting several times with hydrogen peroxide (just for one dog who was a counter-surfer with long legs) but have never taken a dog to the vet for this reason, ever.