Take your dog to vet immediately because he might be having canine bloat that is a life threatening condition in which stomach become filled with air after eating. Bloat in dogs can put pressure on other organs and abdominal veins. Twisting of stomach can occur. This condition can cause death if not treated on time. Symptoms of bloat are restlessness, pacing, salivation and foamy vomiting. This condition is diagnosed with the help of blood tests. Canine bloat is medical emergency and requires vet visit urgently.