A dog is more than a cow. Cows are domesticated to be nothing more than walking bags of meat with enormous udders for milk. Dogs can be trained to do all kinds of useful things like helping blind people, help the police find drugs, and in general just be a good companion for a human. Yes it's worse that they do it to dogs than other cattle, because dogs can be much more. Dogs were domesticated as companions, not as cattle. Using your logic, it's just fine to kill and eat humans. You have fucked up priorities, negro.
So...raise it in conditions that make it happy and kill it while it's knocked out. Just like cattle. I don't think that putting it in a tiny cage and beating it to death on the street is the best course of action.
If you want to whine about sexy/cute animals suffering, read up on natural muskone (the compound that makes perfume retain a particular scent).
It's produced by harvesting a deer's pheremones by scraping them off of the deer's anal scent glands while it is alive. In fact, they raise them in cages with a hatch in the back and the cage is so small that the deer can't turn around in order to make it more efficient (they don't kill the animal while harvesting the muskone). It's only legally produced in China but it's exported to France and Japan.
The worst thing is that it is cheaper and more efficient to produce the same muskone compound synthetically but some people think buying something "natural" is better. That's far more outrageous to me than seeing a bunch of farmed dogs raised and killed the same way that the chinese probably do for all their other meat.
