I think people would still take issue with me buying a puppy, raising it for a year, and then shooting it in the head to eat it. If that's true, then I think people are actually far less cool with the "one bad day" argument than they think.

Even if you treat an animal like royalty for years and decide one day to kill it for food or clothing or whatever, you are still doing something wrong. Our treatment of anything does not grant us the privilege to end its life.

We feel this way about dogs and cats, and other humans, but never pigs or cows or sheep or goats or fish, etc. And there is no reasonable explanation for why, other than speciesism.