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Thanks for all the replies. Now I am really confused. Some folks say it is a dominance thing others say that mounting behavior is just a play thing.
I have gone on line and read much on this. It seems that Nixa's behavior is a little bit of both. But then Nixa's has only tried to mount one other dog
and it is always when they
are playing and tearing about the yard.
The organization that I got Nixa from says that this a dominance behavior and should be stopped. Nixa is an assistance dog and only tries to hump Bailey (the other dog) when I have taken off her vest and leash off and give the command to go play.

Thanks again,
Renee (Nixa's Mom)
Like I posted, it can be both. When it's play, it's play. When it's a dominance thing, it's dominance. I've never seen my females try to get dominance but my males have. I dog watched an unneutered male for a week. He immediately mounted my neutered male. My male is a very stubborn pitbull. The unneutered male also tried to growl, nip, etc. He immediately learned that he wasn't going to dominate my dog.
Google your question and you'll find the same reponse that I posted. There are hundreds of dog training sites.. they all say... play or/and domimance. If there are no fights, real fights, I wouldn't worry about it.
Thanks for all the replies. Now I am really confused. Some folks say it is a dominance thing others say ... only tried to mount one other dog and it is always when they are playing and tearing about the yard.

Just because it is a dominance behavior doesn't mean it's adversarial. I think it's normal for dogs in groups to remind each other frequently of where they stand in the pack. Sometimes they'll do that during play. Also, during play, some types of behavior are acceptable when performed by the alpha (or "top dog"), and the same behavior by a lower dog will earn a
reprimand from the alpha.
I have 8 dogs, 6 in one group and 2 in another. I recently introduced (on neutral ground) 1 dog from each group that had not previously met without a barrier between them.
After they sniffed each other, the older dog laid her head across the younger, larger dog's back. She's too old and fat to "mount" him ;-). He stood like a statue.

Then the younger dog play-bowed, with his head held low and tilted on the side, wagging his tail, and then laid down and allowed the older dog to stand over him. They formed an X. The older dog moved away about a foot and stood at attention, and the younger dog got a toy and dropped it in front of her, and laid down again.
Looked to me like they had just "talked" about who was over who and both accepted that the older female dog was higher in the hierarchy than the younger male. Nobody growled, nobody snapped.
I would expect, if they played together, that the older dog would sometimes reassert her dominance during play. Maybe by standing over him again, or taking the toy away and guarding it briefly.
The organization that I got Nixa from says that this a dominance behavior and should be stopped. Nixa is an ... (the other dog) when I have taken off her vest and leash off and give the command to go play.

I don't think it's anything to worry about. I don't think 2 (or more) dogs can coexist without forming a pack, even temporarily, in which one dog is the alpha. Again, this is not necessarily a bitter, adversarial process. In the wild it would have been a survival disadvantage for the species to always fight to the point of serious injury over who would be the alpha in a pack. Pretty soon, there wouldn't be a pack, huh?

A behaviorist in the group might be better able to guide you; I have no formal training or credentials in this area, just many years of owning more than 1 dog.

flick 100785
Thanks again for all the posts and follow up posts. I feel much less confused about Nixa's mounting behavior. I think that it is a play thing. Both Nixa and Bailey will take turns rolling onto her back (the both are females) and letting the other dog stand over her.
There is never any growling, nipping, snapping or rough play. Nixa and Bailey
both get in play position with each other. I have never seen either Nixa or Bailey put her head across the other's back.
When I think about it Bailey has some interesting behaviors too. After Nixa and
Bailey have run around for a bit, if Nixa stops to rest Bailey will often take
Nixa's front leg in her mouth and tug. It's as if Bailey is saying: "hey I still
want to play".
Since Nixa is never aggressive and has never try to mount any other dog, and Bailey is Nixa's favorite doggie pal, I will stop freaking out about this.

All of you are great and I have learned a lot.
Renee (Nixa' mom)
Exactly! You worded it perfectly. Now put on your flame coat because you mentioned the evil word dominance!