Anybody who think animal behavior is a good way to know about another human being is crazy.

see my reply about chilren

Yes and no.  

Picture this:  you see someone with their skinny little dog that's always shaking and wincing.  What do you think of that person?  Automatically think that they abuse their pet?  Or do you possibly think that maybe they've just adopted that pet from a rescue and their previous owners were abusive?  

It'd be a better measure of a person to actually SEE how they treat animals, rather than making assumptions based on how the animal reacts.