Not to me, it isn't. The U.S. kills them for convenience. Seems like the same reason to me. The big differences are that we (a) take away their freedom first and (b) do it by the millions.
I wasn't in any way disagreeing that it's upsetting. You saw my first sentence, right?
I was just saying that to focus on hundreds or even a couple of thousand of dog deaths when we do worse is a bit hypocritical. Not of you, specifically - of all of us that do it. Me included. Regardless of the extent, though, I hate the waste of it. To take life for no reason but for sport or convenience shows a lack of respect for life and is IMO, and with no exaggeration, evil.
And, yes, I think factory farming is right in there. Why? Because it often shows the same lack of respect. And it does so for the same reason as above - convenience. The ends don't justify the means. Got milk? Well, if you do, some milk cow was almost surely artificially inseminated - and while we joke about Twister escapades here, I'm guessing it isn't that pleasant - just to keep her pregnant to keep producing milk. As for the calves, well, you might love veal, but I hate the practice of it (at least as done in the U.S.). For big egg producers, hens that lay eggs are caged in buildings by the millions and never see the light of day, then mass exterminated and disposed of after about three years to make way for a new "crop." They have no choice in the matter. I work in a cubicle, and I might not like it, but I choose to do it. Animals can be raised for food while still being shown respect.
And, no, I don't think a lack of respect for human life is any better.