Been my experience most of the conflict starts with the retrievers. Most of the fights I've seen is a retriever trying to take game away from the first Dog on the kill. I'm not a Dog snob, if the dog will do the job I put them to work.

The trick is to spot their natural inclinations, foster those and even to modify (adapt) your hunt to your Dogs strong points. Basically, instead of trying for a cookie cutter Dog, you adapt.

Pure breeds make the job a lot easier, my last pointer/gun Dog did his pointing duties naturally and needed no real training at all.

I Hunt the heck out of Pheasant with my two Terriers. We have a lot of hedge rows between cultivated fields. My Terriers do an outstanding job of flushing Pheasant out of those hedge rows. They get into spots the pointers and retrievers can't. They've flushed many birds the other dogs have bypassed or gave up on.

But if your Dog is naturally aggressive, good luck. Very few ways to cure that completely and reliably. My Plummer Terrier takes no guff at all from other Dogs, he is less likely to go off on another dog on a hunt away from home, but when he does it is a mess. He latches on a refuses to let go, I keep a strong stick in my pocket to pry his jaws open.