Ok, am at my wits end and in all my years of dog owning have never had this before, but I have never had a 'boy dog' at the same time as other dogs...
All hell has broken loose over the last couple of weeks. Plus, I have just found out I am pregnant again, so can't really afford to take any risks. However, I am determined to find a solution that involves keeping all the dogs, whatever that may be.
It started with our two bitches, Mum, 5 and her 2 1/2 year old daughter fighting. It started over our rescue puppy, a currently un-neutered boy, 9 months. Daughter was telling puppy off, Mum objected and told daughter off. Daughter has always backed down to Mum, but the first time they fought, after the usual appeasement signs from daughter and Mum not backing down, a fight started. I managed to seperate the girls and get one outside. (I was on my own) All together again ten minutes later, no problems.
Week later, daughter in season, so she is seperated from the others due to un-neutered boy dog. After half a day I let Mum out in the garden to be with daughter so she had company for a bit and a fight broke out immediately. Currently, Mum and daughter will fight on sight.
Now, Mum has decided to fight with the pup. He does annoy the other dogs a bit and is the 'bound in and annoy the hell out of them' type (staff x lab x collie ish) He is also a bit confrontational with other dogs at times, and can be nervous, we assume due to his start. (from pound, not socialised at all until 14 weeks, roughly treated by several humans including 'kicked around the house' for mouthing a child
)
The fighting has resulted in minor injuries to all three dogs (dog no. 4 keeps out of it all) but Mum has some quite deep puncture wounds and has seen a vet for these and a general check up. My husband has also been bitten twice whilst trying to seperate the dogs. (his own faulty, he got his hands in the way!) All the girls are very, very well socialised, usually very good with even the most difficult/undersocialised of dogs and no previou temprement problems.
We discussed spaying Mum with the vet and I think we will do this as we were planning another litter from her and then to spay her, but obviously in light of this a second litter won't be happening, so we may as well spay her now. I also discussed neutering boy puppy with the vet. However, I am concerned about it making his nervousness worse. He does occasionally become defensive when out on his lead, but this is improving all the time now I can walk him myself. (previously husband doing it due to pregnancy/medical problems) I discussed Tardak with the vet and understand this works for six weeks, but my vet said it can have a sedative affect too, so may not give a true picture of what neutering would do.
We do have a behaviourist (good one we hope, obedience/agility judge and APDT listed) coming out Weds morning. I have also been using DAP spray in the meantime as unable to get a plug in (Not sure if it is even safe for pregnant women though?) and walking the dogs half to death in an attempt to get them so tired they just sleep all day. 
I'm not really even sure why I am posting, more to de-stress and get it all out as much as anything I suppose. Any thoughts at all?