Water: Dogs usually take to water easily, but if you mess this up, it'll set your training back weeks. To help the initial foray go smoothly, do it on a warm day in a pond with tepid water and a gently sloping bank--those three factors will eliminate most issues. If a pup is still hesitant, don't force the issue. Instead, wade out into the water with the dog and splash around, or bring a more experienced dog along to lead the way.
Game:** Whether it's a bird, a coon, or a cougar, the key to introducing dogs to game is to start small and make it fun. Don't throw a small puppy in a scenario with a hook-spurred rooster; instead, try a wing-clipped pigeon or quail. Let hound pups chase a captive coon in a roll cage--or even the family cat up a tree (just not too often)--to awaken his desire. The goal is for the puppy to gain confidence and proficiency in handling smaller game, which will help him tackle larger prey without hesitation.
Gunfire:** Early experiences with firearms can have a lifelong effect on a dog. A gun-shy dog is a manmade problem--poor judgment in this area has ruined more good dogs than anything else--and it's almost always avoidable.