Quick update, the dogs are doing well on Pro Plan, but not really noticeably better than when on the Black Gold. I'll continue to feed for a few more weeks just to feed it for a month and give it a fair shot, but I dont think I'll keep feeding it after that. They're stamina is still very good, in fact we hunted ALL day a few days ago and they were all still going strong by the end of the day, no lolly gaggers that day. The one thing I dont care for is they have more stool than when on Black Gold. It's comparably firm to the BG, but there's more stool. They put on a little weight (not much) when I went to Pro Plan so I slightly reduced the feed amount. I also thought of mixing Black Gold w/ Pro Plan... Who knows, I'll repost in a few weeks.