We need to stop testing things on animals.
Why might you ask?
Well, first it is just plain cruel to test something like a beauty product, or even hairspray on an animal. If there is something wrong with the formula, who knows what could happen to that poor animal.
They do not choose whether they want to do this or not, and they do not get paid to take the risks of testing things that are not even made for animals.  
Animals can die or have long term health effects on their body if they do not react to whatever is being put on them. More than 110 million (!) animals are killed in U.S. Laboratories per year and only 3% of animals survive.
Animals are normally killed after being tested to study their body, tissues and organisms which is also another devastating thing.
So, make sure to always buy Cruelty-free products so you are not supporting this horrible cause!