Over the last week our Luke has started to become more aggressive when he is excited. He is 3 months old now. He will sometimes run up to you and start biting your shorts/jeans etc. and biting on your legs. We try to get him to stop by saying no or stop and pushing him down or lifting him up on two-legs, and also trying to distract him with a toy or something... but so far this seems like some behavior that we need to work on removing as we don't want a biting (to him im sure its just play) 100+ lb adult berner.