Min & twiceover2 - bless your hearts! How kind of you
I'd be very nervous and would feel guilty if he caused any problems with your resident dog(s) and I knew about it (via COL). He should really be assessed before any new home too.
Tenaille - I have considered a muzzle but I wasn't sure how long at a time I could use it. The muzzle and crate would need to be used when the girls are home from school (from 3.45pm).
Markr64 - thank you for your kind words, it really helps me cope
siam - it is strange but the other daughter hangs around me far more and he has no beef with her.
Ironically, he has more 1:1 attention than any other dog I know as I work from home (however, maybe that is the problem).
henryjack1dogs - I am working on recall but it is step by step and I won't get to the off lead part until beginning of October! The muzzle isn't for when he is out and about - he is fine with everyone and other dogs then, however he is deaf when I try to recall him and it's awful when I have to run over to retrieve him.... He is totally obsessed with me, always has been but I do everything as hubby works 6/7 days a week and is often out at evening meetings/late in. I had the girls feed him but since the attacks, have stopped this. I am trying really hard not to show my anxiety etc but I'm sure he'll be picking up some of it.
Thank you assumpta, it is easier to imagine my scenario and what is having to be done if you have children.