ok I talked to vet dogs been check and in perfect health and no worms So this is waht he told me . as far as Halo trying to eat his stool with the food switch in a way yes it was the food, but the food is not a bad food, what happens is If the dog can't digest it all when they eat it it will infact remain in the stool and then they smell the undigested food and they will do this. So The food isn't bad my halo just doesn't digest it. But natures recipe does have another one that is highly digestable so I can try that one instead of the reg adult formula. I knew something was up and thats why with the other food they were ok. So now i know and I hope this helps someone else too. NATURES RECIPE is ok my dog is strange LOL he can only digest certain foods.