I also have a boxer as well as my two yorkies, they get along great. There are quite a few members here that have boxers as well.
My boxer Breeze(about 8 months)was scared of my little female yorkie when we brought her home. It was funny to see my big dog saying " Help Mom, save me!!!!!!" They have got along really well, my boxer is very gentle around the yorkies and I was more worried if my boxer would be safe around them, lol.
Good luck finding your new baby.