I know this is an agility forum, but hoping there will be people who have lots of advice, I have three working Cockers. They are all fed on a local dog food that is on par with James Wellbeloved/Skinners. It is great for two out of the three, but I am looking to change my youngest. He's 17months, and is a skinny rat! He's happy and the vet said he's healthy, but I can't help feeling he's not getting enough from the food, 90% of poo's are good, but he goes quite often and some can be runny. As well as the food he gets carrots as treats, and also a small Sardine with his main dinner. Any ideas that won't cost me the earth?