I do this with venison for my pulled venison sandwiches (I do the same for pork, and am assuming it will be good for other meat):
Whole venison roast (recipe is for about 1 1/2 - 2 lb roast)
2 Tbsp of minced garlic
2 cups ketchup
1/2 cup brown sugar
1 tsp chili powder
1 tsp cayenne pepper
1/4 cup red wine vinegar
sprinkle of cumin (you just want a little)
Whole chopped onion
tsp dry basil
I mix all of the ingredients in to a bowl then pour them into the slow cooker. I make sure to roll the meat in the sauce and get it nicely covered. I turn it on hot for about 3 hours, then I cut up the roast and turn the heat to low for another hour or 2. As most of you can attest, deer dries out easy, so it's important to watch it closely that it doesn't get too overdone.
At about hour 3, when you chop it up, add a shot of whiskey or scotch and let it cook into the meat. It adds a really nice flavor. You can play the one for you, one for me game with the crockpot at this point if you want, but I'd advise waiting until after the deer is done.
After the deer is done cooking, pull it apart with a pair of forks and serve it on some buttered buns either plain, or I like to throw a piece of pepperjack on mine.