disobedience

Hello! I’m new to the forum so I hope I’m doing this right. I recently adopted a 1 and a half year old pitbull mix. I’ve only had him for a bit more than a week and he’s an absolute sweetheart...except for one thing. Now that he’s gotten comfortable he’s gotten this really bad habit of jumping...

How would you start to train a large dog that is showing dominance around people? It is 2 years old, maybe a little older. I am thinking about looking after it for a few weeks for a friend of a friend who is going travelling it but am unsure because I have children. It is one of those large...