Why stop animal testing?

Although animal testing is effective and gets clear results about the effectiveness of many products, it is creul to subject a living animal to pain or to cause it to potentially suffer in any way. Animals used such as rats have good nervous systems (like we humans do) and can feel pain just like us: it is unfair to risk hurting the animal. Also, we wouldn't like it if a giant rat tested green dye on our skin so we should not do that to animals as they probably don't enjoy it either.