HELP please our puppy has a bad tummy, we have had our beautiful Harvey for 5 weeks now, he is 13 weeks old. For 2 weeks he was fine on the breeders food but then got diahorrea. The vet gave him sensitive canned food to help which it did. Every time we try and gradually ween him back onto any sort of dried food - sensitive, or puppy dry food he has a bad tummy again. He is awake 5 times a night to be let outside to poo and for minutes after he pushes and has just liquid dripping out. It is horrible to see him like this. The vet just keeps putting him back on the expensive canned food which helps but we want to give him more variety and make his tummy better. We are very tired and sad to see him like this. Please please help us.