Dogs aren't nearly as domesticated as you might think. Left to their own devices they quickly form packs where they can and have taken down lamas and deer. And who's unaware of dogs mauling human beings, the Golden Retriever/Labrador mix that just last month dismembered a two month old baby, or so many other vicious attacks?
Take note of your inclination to inflict pain on your fellow man with a "roundhouse kick" but not a dog that might rip the face off a defenseless child. The dog was used as food. Sustenance for human beings. What you suggest is law based purely on sentiment and not logic.
There is no way to live on this planet without killing other life forms. No way. All creatures do what they must in order to ensure their own survival. Animals are killed, maimed, and displaced by vegan diet. Imagine how many would be negatively effected were we all vegans. Think of the detrimental effect of faux fur that takes years and years to decompose. I find it so ironic that many of the same people who push for environmental issues and no meat eating are the same people who strenuously promote (with their mouths) the use of synthetics over natural materials including food.