Quote Originally Posted by daisybee
I've kept him on the same food for at least a month and he is also neutered.
In my experiences with food and seeing (or smelling ) results is that you generally won't see results of a new food you're feeding for six or so weeks. That is so the new food is fully in their system and you get to see the results of the nutrients doing their work. That could be a factor -- choose a food and try sticking to it for longer than a month to see if that works.

Just try to regulate his diet as much as possible, do not introduce anything other than his food and maybe a treat or two a day (as in, no table scraps, special meals, etc) until his body is completely and fully adjusted to the new food. And as mentioned, it could take as little as a few weeks to as many as a few months!

If nothing else... I know places like PetCo sells a product like Beano for dogs to help with gas... check the remedies aisle