Why Your Dog Vomited White, Sticky Fluid

White sticky vomit can be saliva from food poisoning (chocolate, onion, grapes), a throat obstruction from bones, or a viral infection like parvovirus or distemper. Food poisoning and obstructions are emergencies needing the vet; for viral cases, a vet may use antibiotics plus immune support, with diarrhea and lethargy as warning signs.