Mate- Dont keep your dog too lean.During excercise ,the dog may need to call on some fat reserves.If there are none, then muscle breakdown occurs to some extent.A dog in for a hard day should start with some reserves.
before i fed eukenuba, dog would look like his weight was fine, then after a day on the fens, he would look like a skeleton. now he comes off the fens the same as he did going on them. i,ve used this stuff for the last 3 seasons and wouldn,t touch out else. i do put him on a less protein diet threw summer when he,s not run.