Many cat adoption centers won't let people adopt cats if they'll let them outside. And those cats are living a better life than squirrels. I disagree with that, but the way I'd put it is, eating wild animals (modulo overfishing) is unquestionably morally right, but with captured animals, well, you noted that they're injected with hormones. That doesn't make the animals unhappy. I think you should concentrate on what the animal's mental state is, and not get distracted by aesthetics.