I'm actually against animals as pets in general.
Not to the point of saying 'you shouldn't have a dog' or anything like that. Go ahead and have a dog, they make good companions and I don't blame anyone for wanting that. But also don't do it flippantly. It's not a throwaway accessory.
Too many people become caretakers of animals without considering all of the responsibilities, and when a problem arises their first response is 'get rid of it'.