Considering Rehoming. How Do You Choose Who?

[Sharna3]

So, we have 2 dogs. Female Husky - Jazz, 7.5yrs, had her for 6.5 (got her as a rescue @ 10mths). Male Mastiff - Harley x, 22mths, had him since he was 6 weeks. (Yes, I know that's too early, long story and not the point). Both are sterilised.

We got Harley as we had lost our Rotti and Jazz was starting to fret. She'd always had a packmate, and after a few weeks alone she started to get very mopey and depressed. The dogs got along brilliantly until Harley hit about 14mths. They had 4 fights over the space of a month, the first one instigated by Jazz 100% and the other two more of an even fault thing. During this period Harley got sterilised and that, plus our efforts at behaviour mod and we also went to a very good dog behaviourist, seemed to help immensely and the 'pack' was fight free for months.

We've just moved - 6 weeks ago - and the fighting has abruptly returned. They were fine the first 3-4 weeks then have had 3 fights in the space of 10 days or so. All of these fights seem to be the result of Jazz becoming defensive and Harley either misinterpreting OR taking the 'opportunity' and he then attacks her.

He has a good 5 inches and 25kg on her, so its no fair fight. He is not inflicting serious damage on her physically however she is definitely becoming more and more unsure of him which is perpetuating the cycle.

We are still working with our behaviourist and have hope that these two may still resolve this behaviour but it was inevitable that the last resort option of rehoming one of them has to be considered. Aside from how heart breaking this would be for us - the difficulty is trying to work out who to rehome? Do we go with our inital heart reaction and keep the dog that we had first who has been with us for years and years? Or do we look at it from a 'who could be more successfully rehomed' perspective?

Would appreciate advice from anyone who's had to consider this horrible option ... I know every situation is different but just looking for any sharing.

Thanks.