Loper

Wolves are very intelligent animals, and they are lopers and they are survivors.

When I was still some distance above the ford, about a dozen prairie wolves and one loper* wolf ran up from the water. They told me that there were no Indians near here or they would not be here; and they were not here long, either. [...] the big loper left on a slow gallop [...] Loper, corruption of Sp. lobo, wolf.

Besides the cattle company paid a bounty for each coyote, loper wolf, panther, bobcat or bear. We had to buy our own six-shooter but the company furnished ammunition free. So it can be seen why most cowboys were pretty good shots.