Goat keeps challaging me and other people

[lumpy]

I need some advice here, My Goat MOOSE (Alpine goat) when he's with me by himself he come by he's name, stops, does everthing a packgoat should do.
Now the kicker when somebody else is with me he challages me and runs his horns towards the other person. I do throw him on the ground and sit on him then he's fine for a little while. What else can I do to stop him from doing this. thanks for the advice.