arnold
yes it could be the problem--he might be lactose intolerant. take him off of all dairy products for a few weeks and see if he improves. milk. cheese, yogurt, ice cream, baked goods that contain milk, pan cakes etc. use rice milk or soy milk or mocha milk. many things contain milk so be careful. but first wait until you get his test results it might be something else that is causing his stomach problems.