[concretegurl]

Here's what I've done with my dogs...

I do doggy time out here removing the trouble maker...when someone is out of hand (it's always Princess) she gets put in the other room for up to 2 minutes at most (usually 30 seconds to 1 min as dogs have the attention span of a toddler). Never crate-it makes it a cage, that leads to many other problems, another room where they can't see you-they are removed and can relax too.

Then they get to rejoin the pack and try it again...at the first sign of aggression they are given a command "no" or "stop" "be nice" no response from them, they are removed instantly ...over and over and over...once the command is obeyed a positive reinforcement is given, be it petting, praise, or scratching of her spot or a treat etc.

Then again we don't have anywhere near that extreme, Princess just likes to bite Elvis' beard hairs and pull him or hump him or push with her paws in dominant behavior displays...she does bite Scoobers legs, and they all wrestle and 'fight' but none of mine have ever broken each others skin either...or actually fear each other.

I had to use a soft muzzle for forced socialization with aggressive behavior due to fear aggression, once before a long while ago...are you okay with, can you use a soft muzzle on her to show her she can't bite and needs to play nice?

It's a last resort for a first step-every time she attempts to bite it goes on. I'd be hesitant to do it unless they really can't be together without Soph attacking Allie every time, and only when everything else has failed, never leave a soft muzzle on for long periods. It goes on when biting starts for a couple minutes then it comes off over and over...we also used it for grooming with a fear aggressive nipper...but again it can be too much of a crutch thing and doesn't really stop the behavior...it just makes training safer in extreme situations.

I did it to take my dog to the dog park, and because he was nippy and I had children around...and to groomers, whom he bit, we used it at home after that to train for grooming so he could go back to a groomer. Now he's the most social friendly guy ever. I had to be really careful not to rely on the soft muzzle though it was just like a time out, quick and then done and try it all over again...

I'm so sorry you are having to go through this, and poor Allie too, and have to debate re-homing. Stopping the behavior immediately has been the most important, things like having dogs altered helps immensely, and making sure everyone gets equal attention and enough exercise for their energy level can make a huge difference and stop all this in the immediate. I never crate any of my dogs together...they all have their own crates, but we don't even shut the door here now they are their night beds...they do share a large play pen-but everyone has their own bed in it.