Combination of potato and not too rich in protein works wonders
There's nothing worse than crate training a pup with loose bowels. I can't recommend this food enough. I've used it to sort out two puppies who just couldn't seem to handle tinned foods, frozen minced meat foods, or other, more expensive dry foods with a higher meat content. One of them had been weaned onto unbalanced rubbish and the other I imported and I think he caught something off the floor in customs in addition to the food he was weaned on not being available in my own country.