Fizzelina - whats the body language of the two of them when your dog is going crazy barking? Is your dogs tail up, ears forward or tail down, ears back - is it dominance or fear?
And the other dog - tail up or down - ears forward or back?
Could be the other dog is sending signals to your dog that say 'im the boss' and your dog doesnt like it - or your dog is sending those signals and cos the other dog isnt listening your dog doesnt like it!
I think they can just be mad in general, one of ours is afraid of the noise of the steam iron and when any kind of match is on telly, the other is afraid of plastic bags, pots and newspapers. Who knows how their minds work!
I think I have sussed why none of our three dogs will come into the room when any kind of match is on telly. It's because they never know when one of us is going to let a roar out - 'go on; hit it; yes; f..cking eejit; no; etc. Most of us would not normally go around roaring like this so they think we are shouting at them.