I have a 5 year old BL that is soon to be 6 in October. This past year we have had to take him to the vet 3 times for extreme gas build up. He is 120lbs and lean so when his belly/intestines seem to bloat it is very noticeable. He drinks water like a lunatic and therefore most likely swallows a bunch of air but he has always done that. I am curious if switching food from a higher protein to something closer to a prescription dog food might be best. With that said most I have found are $100 a bag and again, he is 120lbs. If anyone has had any experience like this with solutions I would be very interested to hear about it.