He throws anything liquid we try to give him back up. He is about 4 years old. He throws any solid back up too. It is almost like a white foam. He doesn't eat anything bad he just eats his cat food and water. By the way: he just got over a nasty cold that took him out for about 2 weeks. We are taking him to the vet but I want to know whats wrong. Answers ASAP!!!!!!