My mate just rang me to say that he took his plummer dog to the vets cos,it was spewing and shitting blood first the vet tested for parvo and lepitosis both came back negative he then asked him about the dogs diet and when he told the vet he was giving the dog grapes as treats the vet reckoned that the dog won't make it til morning cos grapes releases a toxin in the gut and told him to put it down . Have anyone ever heated of this