My brother has a dog. 6 mo female Queensland terrier cross. She has excessive drooling which is clear and very thick. Vomit is a foamy, yellow/orange color. When she walks she staggers and appears very weak. The only time she does walk is when she goes over to the conner to vomit. She won't let anyone(including her sister) near her. I have a pretty good idea what this is but wanted to get a second opinion. The vet hasn't been much help. They won't give any advice over the phone and my brother can't afford the $60 visit right now, not to mention all the tests.