Anytime I see a story where the girls need money it feels ridiculous, but this time especially. I am pretty sure at least one, if not more, of Sailor Moon's techniques actually does heal. Or at least reverts things to before they were damaged. Now, yes, using that sort of power on a dog might be a bit much. But it is less ridiculous than turning to prostitution and exposing their identities to pay the dog's medical bills, and they did that.