can't we all just get along?

[wildwings]

My 2 labs ( 2 year old male, and 1 year old female) seem to loose their sense of hearing when they are together. The older one will usually listen to me, but not near as well as when we are alone. The younger one seems to almost ignore me when the dogs are together. Because of this, I haven't had them together much. I'm trying to get them used to each other, because I want to hunt them together. This year, the younger isn't far enough along in her training, and I don't plan to hunt her much, if any. SHe is making great strides in her obedience. But when they are together, alot of her obedience goes out the window, and they just run and chase together. the don't seem to be fighting, and never growl or bark at each other. are they just playing, and they will grow out of it? Are they determining dominance? THe female is a tiny 40 lbs, and about half the size of the male.