I love animals, but I think "What do pets achieve in life?"
There is no right or wrong answer to this question because we don't know what an animal feels, obviously. However, I do think that it is good that we put them to use rather them just minding their own business being fed, having their cages cleaned etc. except from if they are harmed or are put in dangerous situations. There are animals that are useful; Dogs for example, have 220 million smell receptors compared to a 5 million that us humans possess so they are able to identify many things with their noses that we can't.
There is always a risk of injury, sometimes severe, in all sports. But people take the risk because they love to do it and they can get good money and be famous. Do animals know they are famous? Why should an animal risk itself when, quite honestly, they don't have an awful lot to achieve through doing such a thing?