New problem with barking dogs

[LampsAndWatches]

I have 2 french bulldogs, they are 3yrs old
we have a very car reactive dog living opposite who barks on and off all day and recently a new dog that screeches when taken out for a walk.

If I’m out of the house and my boys hear the above (I can view on our cameras) they react and end up fighting. 1 of my boys barks back and the other tells him off and they get in to it for a few seconds.

I’m looking for some advice on how to stop this. They have the kitchen, hallway, and garden to themselves when I’m out and DD is wfh in a garden room.

someone suggested giving DD a pet corrector spray as it mainly happens in the garden?
I’m thinking of crate training them again for when I’m out? I suspect my barky boy won’t like this at all but I hate seeing them fight and they don’t fight over anything else.

Keep them in separate rooms.

Please don't use pet corrector spray.

Can they see the ddogs or just hear them? Restrict view... Radio on to mask barking. Spilt ddogs up if you go out... Do not spray your ddogs.

Do not use a pet corrector spray. And yes if they fight they have to be separated when you are out.

They can only hear them
I always leave the radio on

They wouldn’t cope well in separate rooms. I’m at home with them a lot and they are really bonded, always sleep together, no problems eating together, treats, and toys.

crate separately in the kitchen sounds like the best idea.

the corrector was recommended just to stop the start of a fight in the garden, is it really a big no no? I wouldn’t use it for barking as they do listen to a firm No.

Yes, never use pet corrector spray.

The risk is that they associate the scary noise with each other (escalating the fight) or the dog they're barking at, or worse, your daughter using it and they could turn on her and bite her.

It’s getting worse and I have no idea why.
all of a sudden the door bell going causes them to jump up from sleeping and having a fight.

and today we were BBQing as a family and I gave them their normal treats because BBQ food was around and they fought over a treat when they had at least 1 each and more on offer.
I can’t work out who is starting it although I have separated them today when they started to stare at each other.

being flat nosed dogs there is more noise than injury although that doesn’t make me feel any better about it.

Are either/both of them neutered?

Are they littermates?

Both neutered and they are brothers

I naively didn’t know about littermate syndrome
I trained them separately and walked them separately in beginning.

they are 3 yrs old next week

If they're littermates my experience is that once they start to fight it's almost impossible to get them to stop unfortunately.

You may have no choice but to keep them separately unless under direct supervision or get one of them re-homed.

@coffeecupsandwaxmelts thank you
I’m going to try training lines in doors again, go back to clickers with “Good” treats
I don’t feel hopeful after today. And I need to work and be present for our family.
I’m trying to read and see if this is a phase that will pass

If you're determined to work on it then I'd recommend getting professional help from a behaviourist - when aggression is involved it's best not to try and fix it alone as if it goes wrong, you (or they) could end up very badly hurt.

Just a small update

I’ve started desensitising them with ring door bell noises on my phone. I ignore any barking or give a no command if they start getting in to it.

we then walk to the front door with a sit and wait, I have treats on me. It’s 3 days in and they now both sit and wait whilst I open the door, say thank you and close the door with a treat and lots of praise.

i just need to get everyone else onboard with the new routine as consistency is going to be key.