[ZYNE]

Alright ya'll, I have a question I'm desperately in need of some insight on. I have a 3 month old female named Ammi who's a total sweetheart ... with me.
In the last 5-7 days she has shown an aggressive side with my wife which culminated this morning with her biting my wifes hand and leaving a 1/2 inch deep puncture wound.
She is VERY obedient with me and we focus her life around having to work for everything, exercise, calm/submissive state of mind, structured play etc. She is soo sweet with me as well as with my wife, the majority of the time.
What set things off today was my wife was drying her paws (we are VERY gentle with her paws) after having been out to let her pee and the dog just lost it with her. I didn't see this personally as I was at work when this happened but from what my wife told her she would not submit to her when put in the submissive position on her back or on her side. She whipped her head around and attacked my wifes hand and bit her palm just below the thumb.
I have *NEVER* seen this kind of behavior in her, not even when she had her puppy snarling going on which we curbed easily and quickly. I know she won't do this to me but I'm at a point where I'm actually worried about this.
I'm NOT getting rid of the dog or putting her down so before anyone suggests that, just don't.
She's not an aggressive dog and my wife can often be found with the dog coming up to give her a lick or wanting to lay next to her on the floor while she watches TV or what not.

I'm flabbergasted as to what is causing this other than maybe she is challanging for dominance but yet she obeys my wifes every command except when she gets aggitated like this. I've personally not experienced it myself but I've seen it a couple of times and it's to a point where it would concern me as well if I was in that situation.

If anyone has ANY insight to this, please let me know. I'm truly concerned about this and I need to have her check the dogs behavior right away. Me doing it won't do no good, I could tie a knot out of that dog and she wouldn't as much as raise an eyebrow towards me. We don't treat her any differently either so this baffles me even more ..

Anyhow .. any input would be so very appreciated right now

Thanks

Nick