I was raised in a mix of farming/ranching as well as city living. One of my chores as a youngun of sevenish-eight or thereabouts was catching the chicken for Sunday dinner. My grandmother showed me how to wring its neck. My grandfather wasn't a vet, but he showed me how to doctor screwworms in a calf's navel. About the same age range...
But nobody ever beat on a plow horse, and the dogs and cats got fed and petted.
I don't know how much a vet charges to euthanize an animal. I do know that a poor man's .22 bullet into the brain does in a dog as quickly as one did in Bobby Kennedy.
Hunting? I don't care if an animal is wild or domestic. If you're gonna kill it, do it quick and clean. That's why I worked pretty busily to create a package to enable me to bust Bambi in the white spot. My skill, my rifle's reliability, all that stuff. And why I'm picky about choosing my shots...
I've never seen many folks ever turn down a really good steak or roast. Folks seem to enjoy that meat. Okay, I guarantee you that the meat didn't come from a bull. So: Is using a sharp knife or a pair of Burdizzos cruelty?
(There's a really non-PC joke about "cowboy psychology" and this particular action.)
When I was a kid, my grandmother made money from selling eggs. To keep varmint populations down, she'd leave piece of bread where the pets wouldn't get to it, but varmints could. Back in the WW II era, you could go to the drugstore and buy a toothpaste-size tube of strychnine poison--of which she'd put some on the bread. Was that cruel?
Ever seen a hawksbill shrike eating on a not-yet-dead bird? I have. Is the shrike cruel?
Leaving hunting out of it, I sorta figure that if you don't cause some sort of pain and grief to any animal, you're doing okay. Similarly in the other direction: If you're taking care of food, water, sanitation and providing a friendly atmosphere, you're doing okay.
Politically, the SPCA and animal-shelter folks do a bunch of unappreciated good. PETA and HSUS, well, bleeeeeeeeeeeeeeeeeep.