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I've used K9 Show Stopper before.  It did a good job of helping Bevo put on a little weight.  His coat was already in great shape, & I really didn't see any improvements

Currently, we are using K9 Super Fuel.  Between the heat & their exercise regime, I usually have to increase their calorie intake during the summer.  So far, I haven't had to increase anyone's food, & they have tons of energy.

I feed buffalo, elk & venison to my guys on a pretty regular basis, so I probably wouldn't try Born to be Wild, but I would be interested to hear other people's experiences with it.

Super fuel is the last thing that I would give Peanut! Lol I'm thinking maybe I shouldn't use Show Stopper, because Gingerbread puts on weight easily and I'm trying to get him to lose a little right now. I guess I'll try the Born to be Wild. Hopefully someone will stop in and give some feedback!