Cattle, sheep and pigs ... and chickens, turkeys, horses, buffalo, llamas, camels, elephants, yaks, etc. are all considered domestic animals. Even traditional game animals like deer, elk, caribou and moose *can* be domesticated, but there's not much benefit in it.
The difference mainly is that most people aren't exposed to the killing of their food. My sister-in-law grew up on a dairy farm and each year they slaughter a cow and divide the beef among the family. My wife is from a farming family in Europe and grew up learning to kill pigs, chickens and turkeys ... and it's not always easy to eat an animal that you *knew*. But they do because that's the way they feed their families. And they eat everything ... and I do mean *everything*.
I own dogs and love them as pets and companions. I care for them when they are ill and cry when they need to be put down, but I am not opposed, morally or otherwise, to others seeing them more as food than friend. But who could not love these guys?
I would add that if you come anywhere near my guys with a fork, we'll be dining on leg o' shawn tonight.
I'ma havin sum Siberian doggy toonaight! Bye golly!