
AG can be found reasonably priced on internet offers. I changed to them when Burns shot up in price. Then we moved to CSJ, and we're now feeding Chudleys (much easier for me to get than the CSJ). I can honestly say my dogs prefer the Chudleys, specially the 2 youngsters, their stools are fine and their condition is equally good as when on the AG and Burns. 3 are on the Choice (wheat/gluten free) and 2 youngsters on Classic (contains wheat) ... these 2 are from same litter and would appear that they really are not tolerant of wheat gluten free!
I believe that poo should be firm and kickable, but not rock solid though. It may be that the dog's been switched to the new feed too fast, I'd take about 14 days going from wheat/gluten free of JWB to Wagg, which I suspect isn't wheat free? It may be that the amount fed is too much.
Haven't used Beta with adult dogs, but I know it produces very good puppies, though think it's around £28 a bag ... you'd managed to get AG cheaper.
Hope this is of help.