Animals are wonderful, but I couldn't be a vet because having to put them down would break my heart. Because that's even something that happens on the rehabilitation branch. As for your writing, are you talking creative writing or technical writing? Because if it's technical, sure, go to school for it. If it's creative ... yeah, that's (one of) the biggest lies of the industry, usually purported by literary writers. You'd be better off getting you degree in something else and gaining professional knowledge outside of the craft, because you can write just as good as or better than the lit authors through dedication and finding enough resources.