Any dog that wears a collar is easy to strangle.
I've done that a couple of times to beak up fights.
Once I was lucky and got a grip on both collars,twisted them till the dogs dropped, held on a few more seconds and let go.
Both dogs woke up, looked at each other in a dazed way and staggered off.
Fight over.
Nother time I was less lucky and managed to choke one out while the other went to town on my arm untill I got a good kick in.