2 dogs being people and dog reactive
I have a female year and a half old pitbull mix, as well as a 7 month old golden retriever/lab/beagle mutt (that's our best guess anyway, haha) Anyway, neither of them would hurt any dogs or people, but on walks, as well as while I am sitting in front of my apartment building, they start barking at people and/or dogs as soon as they get too close to me/us.
Also, my mutt (who I got first) has always started barking/howling when he heard somebody walking by our front door, but the pit is starting to pick up on this as well.
What does this behavior mean? What should I do to help fix the situation.
I own the apartment building, so scared tenants are not exactly what I am going for.