What a pity. The vomiting is a tell tale of antifreeze poison. but it reacted fast on my dog anney. It hurts to see them go like that. My condolences to you.Not a mark on him or hair out of place. Only s/sx was he vomited x2 yesterday, day before just fine. I thought he had worms so went to the vets today to get some meds, was waiting for him to come home, got worried b/c he is always home, found him in the yard nearly dead, died w/in moments of us finding him screaming in pain. Pretty positive it was poison, thinking most likely antifreeze.