Gassiness, at least in our house, for my bully means that a certain food is not agreeing with him. For example, if I give him cauliflower, he will be gassy all night. When I was feeding him Orijen six fish, he was constantly gassy but once, I switch him over to something else, the gassiness stop. So definitely check his diet and see which is the culprit. I hope this help.