Your cute little Great Dane puppy is going to be a really large goofy Great Dane dog very soon. Teaching him not to bite now will set him up for good behavior in the years to come when he is a large dog. Great Danes can be intimidating to a lot of people, but they are incredible dogs. Your Great Dane is kind, gentle, sweet, and incredibly strong. Teach him now not to bite so he knows what is expected of him around friends and family when he becomes a giant dog.
Your Great Dane will protect your family in your home. It's built into his nature. He is a powerful, courageous dog. But he is also easy to train, loves to meet new people, will spend his time trying to please you, and he is incredibly patient. He will need to know, however, biting is not okay.
Training your Great Dane puppy not to bite will start with teaching him your expectations of being gentle. There will be appropriate times for your puppy to bite or chew. He needs to understand the difference between biting a person and chewing on a toy to ease any pressure on his teeth or to naturally release energy through puppy playtime.
When puppies play together, they typically end up biting one another. This is completely natural for them in group play together. You will need to show your Great Dane puppy alternatives to biting during playtime and how he should be spending his time playing with you and other family members or friends. Doing this kind of training will take some repetition, some toys he is allowed to chew on, and beginning basic obedience training so you can set the role of leader of his pack. Redirecting your Great Dane when he's biting will be key in reminding him of positive behaviors when he is making poor choices and biting.
Plan on having treats readily available to give to your puppy as you are training him when it's appropriate to bite and when it is not. Your puppy will need lots of chew toys, ropes, or tendons. Items he can tear into as he grows such as towels or blankets you can play tug-of-war with will help release this natural urge to chew and bite. Schedule some training sessions with your Great Dane pup and set him up to bite so you can redirect him and give him alternative behaviors.