Do you have a Miniature Schnauzer who seems to love biting? While you might think this is somewhat normal behavior, there are no breeds of dog for whom this type of behavior in an adult dog is natural or acceptable. Remember, what might seem like playful biting at first can easily turn into serious attempts to bite that can and often do result in injuries. No matter what you might think, there is no point at which your pooch's biting should be tolerated.
In nature, your pup would engage with his litter brothers and sisters in play that often involves in biting, chewing, tussling, wrestling, and many other forms of contact play. It is how they learn about their environment and their place in the family. As they mature, it may become the way they take their place in the pack. At home though, this type of behavior is not needed nor necessary. But, unless you teach your dog to stop biting, he may never outgrow the habit.
Unlike many other forms of training, teaching your dog not to bite doesn't take much in the way of supplies. Of all the things you might need, patience and plenty of time for training are the most important. Of course, you may also need a few chew toys, some treats, and a nice quiet place to work with him in.