It was a bit forced but I get it.

Disney gives animals human personality traits, when people see a horse prancing they think its happy, when in reality its a trained behaviour that was quite possibly trained in through means that people would find abhorent. Same with Greyhounds… yeah they love to chase the mechanical rabbit, you know how to train them really cheaply and easily? Let them chase live ones. You know what happens when they catch them? Nothing pretty.