J.L.
We just got a boxer puppy a month ago and we researched the same question. We ended up getting a male because it is said that females can be moody and more territorial and males can be more laid back I guess you could say. I am moody enough, I don't want to deal with another temperamental female! I know people with both sexes of dogs and I think a lot depends on the breed and mostly, on how its trained and raised.