What is the proper way to break up a dog fight?

That's a great question.  I get in between the dogs just about everytime they get in a fight.  If I can't stop it with my voice, then I get in the middle, and kick them apart.  I feel like it is my job to protect them, not the other way around (unless trained in PP of course, and even then I don't ecpect them to protect me from other dogs). 
 
Dogs should never be PTS for K9/K9 aggression, even if you get torn up in the mix.  If you don't want to get bit stay out of the way.  If you do get bit, scrub it up real well, and move on.  It isn't the end of the world.  This may seem silly, but it can be very expensive to repair a dog after a bad fight...I have found it much cheaper to repair me. 

What are reasons that you would/should get between dogs fighting?

If you get bit severely, do you think that the offending dog should be pts?

 
I'm not sure how I'd react if it were 2 dogs fighting that I didn't know, but when it's my own 2 dogs, there's never a question of would/should I get between them.  The fight has to be stopped, and the only question is how to do it.
 
I also wouldn't consider putting a dog, mine or any other, to sleep for biting me when I was trying to break up a fight.  I don't consider it a sign of aggression, so it wouldn't concern me in that regard.  I would (and did) consider rehoming one of the dogs in a case like ours, but it wasn't because I was afraid of either of them, nor have we ever been bitten.  I worried about the potential for serious injuries to one of the dogs in the midst of a fight and I was also concerned about being able to manage them safely.  It's been 5 yrs and things are better than I'd ever hoped.

ORIGINAL: dogslife

What are reasons that you would/should get between dogs fighting? 

If you get bit severely, do you think that the offending dog should be pts? 

woah! woah!  IMO, dogs should NEVER be "pts", as you so euphamistically referred to it, for a bite inflicted on a human during a DOG fight in which the human was in the mix as well....

i've had occasion to break up more fights than i would like to admit between both my dogs and other dogs, and other dogs, and my dogs with each other.  each situation requires a different reaction:

when my dogs go after each other, it's never a "real" fight, it's a squabble over a piece of kibble or a play session that's gotten a bit out of control.  a loud, deep hey! coupled with a clap of my hands or a stomp of my foot stops them immediately, without fail. 

when it's a "real" fight between one of my dogs and another dog, i reach for my dog's mouth immediately, stick my fingers in and squeeze.  i would not advocate doing this, but it has worked for me 100% of the time- my dogs feel my hand and my presence and back down immediately, and i then put myself between them and the other dog, kicking at the other dog with my feet if necessary to keep it away.  and yes, i have scars from doing this, but a slight bite is absolutely worth the life of a dog for me.  and i have in my favor that my dogs were bred specifically NOT to bite humans, which is why i go for MY dog before i lay a hand on the other one.

when it's dogs i don't know, i wait to see whose dogs they are and how they react.  if they seem able to control the situation, i stay out of the way.  if they get hysterical, then i step in and grab the collar of whoever is on top.  i know this isn't the safest thing to do, and that the aggression could easily be redirected towards me, but again, a dog bite isn't going to kill me, and they might kill each other.  i never make any noise until after the dogs are separated and then i do the "hey" thing to get one or both of them focused on me instead of each other.  usually after that, their people are no longer paralyzed with fear and step in. 

if the 2 dogs were strays, which i have NEVER seen (thank god), i have to say i'd be loathe to step in for fear of whatever diseases they might be carrying.

i hate dog fights, i really do, but i have to say that i'm never scared to break them up.

I hate dog fights too! But anyway we need to break them up even we are scared or else there will be no end.