Hi khayes,
Sounds like your pair have a bit of a socialization problem, both with other people and with other dogs. I wonder, have you thought about enrolling in a social dog class, or obedience training class? This way, they work with you and a surrounding group, and will earn to listen to you despite the distractions around them.
To help at home, have your friends come over and interact with your boxer especially. Make sure guests dont seek him out, but let him come to them for a hello and attention. Ask them not to move fast with him, just starting with simple "hello boy"s and a quick pat on the head. Praise him when he's calm with guests, and if he starts to get worked up, put him in a room by himself to calm down.
Dont let him "patrol" your yard by himself, try to keep him away from the fenceline where he can become agitated by approaching people. When you're out with him and you see him working up over an approaching person (in the yard, on walks, wherever), tell him to sit, and keep his attention on you (good boy, stay, etc). Only let him get up once the person is gone.
As for your bulldog and other dogs, it sounds like you're keeping him on lead all the time around other dogs, which is good, its a great place to start. My own dog had trouble with getting to excited about other dogs, and this was how I dealt with him (and still deal with him! haha): On lead, when he gets going over another dog, give it a tug, say "enough" (or something similar), and then have him sit and pay attention to you until the other dog goes by. If you dont want to pause the walk, just give a heel command and a little tug on the lead everytime your dog perks up at the other dog. Lots of praise for successes, and if he still tugs and tries to go crazy, resort to a sharp tug, pull off the walkway a bit, and sit, telling him "no". He must be sure he's done something inappropriate, so be stern with him! This seemed to work for my dog
I hope you see progress soon, keep us updated please!!