If you find that when you take the pellets away, that the gas problems stop again, and you don't see anymore soft poops, then it's definitely got to be something in the pellets. My guess would be that it's either an ingredient that's in both kind of pellets that isn't in the critical care, or it's excess sugars and maybe the critical care doesn't have too many sugars but the pellets do. After several days of stopping the pellets, and there not being anymore problems, you'll know it's for sure something about the pellets. In that case, you can continue to keep him on a diet of critical care and hay. It's not the best because of the low protein, but you may just have to do it. Another alternative is to try a different kind of pellet with different ingredients than the oxbow alfalfa and timothy pellets. There are two that I can think of that you could try: Oxbow bene terra organic that is timothy based, uses canola and sunflower meal instead of soy, and uses natural fruit instead of molasses, or you could try sherwood forest fortifying essentials concentrated formula, which doesn't have soy either, doesn't have any added sugars or grains, but is made with alfalfa(will also send a free sample). So if you are really wanting to try pellets again, that would be my suggestion, to maybe try one of these, or if you can find anouther one with different ingredients than what you are using. The bene terra still has a lower protein because of the timothy, so you could maybe feed a little more to try and make up for it, but if you can find an alfalfa based pellet that he tolerates, that of course would be better. After he's feeling better from not being on the pellets, maybe you could try giving him a little alfalfa hay to really see if alfalfa is causing digestive issues or not. Cause if it's not, then you could maybe try the sherwood pellets, or at least add alfalfa hay into his diet so he is getting more protein.