I have two rules when dealing with cows and wolves.
#1) No wolf is harmed if it stays in it's own area and only eats wild game.
#2) If a wolf attacks a calf, the cow better kill it and/or die in the process. If the cow shows up with no calf, she is on the first truck out of here. This is an important rule for management. Dad and I always stuck by this rule and our cows don't take any guff from any wild animal less than 150-200 lbs. Cougars, wolves, dogs, etc...all chased off the property by the cows in a buffalo-style defense stance (calves in the center with cows surrounding the perimeter). Straighbred Herefords are good for this. Cross cattle seem to be the other way, as our Char crosses, years ago, would turn tail and run away in every direction...which means an easy meal, especially for a pack of wolves or coyotes.
Neighbour has some Red Angus cows, along with Herefords, and they will run and abandon their calves at the first sight of anything menacing. Could also be management, as this fellow does keep the cow who lost her calf, if she is "a real good cow." We haven't lost a calf in 15 years to a wild animal, while that neighbour, who lives less than a mile away loses as least a couple each year.
I don't ask a cow to do much, but raise a calf and breed back are definite musts. :cowboy: