Assault charges would probably not make Steve very happy. And if Steve were unhappy, there was a distinct possibility that he wouldn't post bail.
Yeah, Steve probably is Not Happy about people who abandon baby animals because they are sick, but Steve can content himself with sharp words and Strong Disapproval.
I like the points Steve and Bucky are making about Bucky's ability to care about animals mean that some of him survived the brainwashing. Also caring about animals = sticking it to Hydra. Screw Hydra!
"If she gets sick and dies while we're gone, she's dying without her family there. That seems like a pretty shitty way to go."
That's pretty worrying. I always worried when I was watching someone's cat, that she would get seriously ill on my watch.