People who treat other people improperly will do it to animals. It’s in the blood. And so I never trust those who are not nice either to their own kind and/or to animals.
I have met people —they look like nice and respectable ones— who abuse others physically, verbally and/or emotionally from torturing to humiliating, underestimating up to ignoring. I’m sure those will do what they do to animals, too.
May all beings be happy.