Dog fight and very concerned!?

I think ur daine might be jelouse..? Idk but my dog Dakota gets a little jelouse when i start to pet my other dog Disney and she comes up to me and pushes disney away...the only reason my dog doesnt fight or growl is because we taught her at a young age not to, and if u havnt taught ur dog to do so u shood start soon...? Also it might not be a problem with all jacks...a lot of dogs have a hard time socializing with some dogs, so its good to socialize as young as possible and i see that ur daine is still young but this could still help with others dogs and childeren to....Hope this helped! :)