My position on this. With domesticated animals, they only come in one flavor, and that's 'completely dependent on human beings to even live in society let alone be healthy and comfortable'. These are beings that have absolutely no ability to protect themselves or live in this environment and owe every second they have on this Earth to a functioning human adult. They can't live here without us, and they can't live in the wild alone. We took them from the wild and went "GEE aren't you cute, let me just selectively breed you for several thousands of years so you look and act more appealing to me, and lose all ability to survive without me". Congratulations, you made this lifeform absolutely dependent on you. Now be a responsible human and take responsibility for what you've done. These animals should be entitled to protection from you because you made them what they are.
A human has at least some measure to live independently, for the most part. For whatever reason, some can't, whether that be through severe disability or some other unfortunate situation, and those poor people should also be entitled to some measure of assistance, but the difference is that it's no ones fault. With dogs, cats and other domestic pets, they need help because we made them need help. They are dependent by design.
Now, do I consider animal cruelty to be a greater evil then human cruelty? I really couldn't answer that. I see the circumstances leading to both forms of cruelty to be so drastically different that I have trouble comparing them.