Do boxer dogs get a long with other dogs?
They can get along with other dogs, but its definitely not what they do best. It will be much less likely with dogs of the same sex. This is especially true of two females. Spaying or neutering your dogs will go along way towards peaceful coexistence.
A lot of people report that they have trouble with their boxer's aggression towards other dogs on the street as well. So if your planing on having other dogs with your boxer you should start getting him or her to socialize with other dogs at a young age. An obedience training class might also be a good idea if you want this to work.