This dog intrigues me

I went out with a doctor to a rancher's house to check a horse with an injured foot. He'd called us ahead of time to let us know no one would be home but that the mare was easy to catch. We drove up and parked near the house and two dogs trotted out to greet us.



Terrible guard dogs, both of them. They each let out a few cursory barks, then came over to sniff us, tails wagging in a friendly manner. Then they both flopped down to supervise as we took a look at the mare.



They have the confident, laid-back demeanor of true farm dogs. They have a hundred acres to run on, yet even though they're both unaltered they stay near the house. They rarely see a kennel or a leash. They're both fit and trim. They've been well-socialized to people and other dogs and animals by the constant stream of workers that come through to work with the cows.



I don't know what mix of breeds created this guy, but those eyes catch your attention, don't they? I don't know where the rancher got him, or what he uses him for or if he's just a pet.



He looks like he could be a street dog from just about anywhere in the world.