It is best for the owner to scold Teddy loudly after he bites someone, so that he will know where he made a mistake. He can also pat Teddy's butt gently, control the intensity, not too hard, and be sure to avoid it. Open the nose. The nose is the most vulnerable part of the dog. Teddy's IQ is very high. When it finds out that you prohibit such things, it will not do it again, so when you say no, it stops biting. You can reward it when it comes to humans. If things go on like this, you will be able to stop it from biting humans indiscriminately.