Originally Posted by Burrowzig

The fact that your pup was rejected by its mother is important here. The mother's milk transmits vital antibodies, and gut bacteria essential for proper digestion. You should get some dog probiotics (Protexin is one good brand), and feed some live goats milk yogurt in the meantime. You can get dog probiotics online, or from your vet (who should see the pup anyway, it could also need antibiotics or steroids). Also, don't free feed. It will help house training if the pup is on a routine as it will need to poo so many hours after eating. If you free feed you can't establish this. Because the pup's digestion seems not to be working properly, feed a hypoallergenic diet, free of common irritants to the gut such as wheat and soya. If the food just says 'cereals', don't use it - the manufacturers will just have got whatever cereals were cheapest at the time! Rice is usually well tolerated. It may be that once the gut has settled down, you can feed a 'normal' diet, or you might have to stick to a hypoallergenic food in the long term.