This is a very interesting topic in my house right now. I have two rough collies and I have been feeding Hills Adult Dog. I was using working dog, as they do a lot of exercise, but one was putting on too much weight and the other, now that I have gone to Adult Dog, dropped weight really quickly.
What was interesting is that I originally fostered this dog as a surrender to the rescue group I am part of. His coat was very wiry and dry, and while he is very energetic, he is a nervous temperament and I put it all down to new environment and having just been desexed. Crunch time came when he was straining the other day with some watery blood in among a slimy dropping
Blood tests all normal, he is calming down with training and routine, he is a happy boy but we are now giving the Royal Canin Intestinal a go.
As an aside our old rescue ChiX has had a bout of pancreatitis and she LOVES ;) the canned I/D.
Could write all day about this...our other collie was an RSPCA rescue, starved down to a weight of 15kg and now at a healthy 24kg, he looks magnificent but if I he is given anything with fat on it, he vomits. Not once but until he is heaving up bile. ;)
This is a pain because we also do agility and the high reward treats that I would love to give him are fatty, which he just can't have. I use Ziwi Peak, Venison and Fish which he is fine with and loves but if you have any other suggestions I would be grateful. ;)