More than half a million people go to the emergency room because of kidney stones. It's estimated that one out of ten people get kidney stones in their life time.
They can lead to many, many complications. They cause intense pain and you are unable to release your urine.
It relates to us humans and animals because we all have kidneys, and everyone can get them. You only need one kidney to live. your kidney is basically the size of your fist.
Something to prevent getting kidney stones is by drinking a sufficient amount of water daily, and by watching how much salt you eat.