My 4 month old has been on arden grange puppy food as that is what the breeder used. His poo was normal but has got increasingly softer. It then got very runny and we had it tested and it came back positive for giardia. He was given expensive digestive support food from the vets and we were told we could start to mix it back with his normal food. We were given medicine for the giardia but hes still pretty bad. We are awaiting tests for other things including salmonella and something else. Hes absolutely fine in himself, hungry and it's not uncontrollable poo.
He's a terrible one for trying to eat anything on his walks and drink dirty water (hence the giardia) and we have got more vigilent with this. But I'm not sure if its the arden grange that is upsetting him as well as the parasite. Our dog trainer recommended Natural Instinct which is frozen raw food. (not sure what you do on holiday with that; not that we have any booked as hes such a chewer!) I wouldn't mind trying raw food but am not sure how to go about it and I don't really have masses of time to devote to makes different recipes so worry about him to having all the right vitamins and minerals etc.
So what does everyone else use if they have a dog with a runny tummy?