My 15 week old Bichon has started spitting up a little maybe twice a day. It's mostly water and a bit of his food. He just started this six days ago. He doesn't do it every day. He eats Origen puppy. I have been using Milk Bone chewy treats to train him. I cut the treat length wise in the middle and then make five cuts cross wise creating ten small pea size treats. I've also used cheese cut up small, cheddar and string, but worried about him getting constipated. He occaisionally burps and it smells like his stomach might be upset. Any thoughts on what could be causing the problem?