I got turned on to Dr. Tims by Scott Townsend when I picked up a GSP from him. Both the GSP and setter are on it. I mix it 75-25 Dr. Tims/Kirkland Premium Chicken. I've had over a dozen dogs over the past 15 years and have tried all of the feeds mentioned in this thread, but none have given the dogs the stamina and healthy coats that I'm getting from the Dr. Tims mix. Nice shiny coats with much less shedding than in the past. The setter goes 6 hours and still has some in reserve at the end of the day. Easy cleanup, too. But in the end the results depend on your dog's tolerance for the feed. I've found it's been trial and error.