I have not put up a pool inthe backyard for the very same reason!! I know the raccoons will come and puncture it. Oh well, that's life in the Northwest!! I wouldn't have it any other way - But there is probably a way to deter them humanely.
Raccoon are not viscious by nature - I have raccoon families come to my back door (because we feed them, otherwise they would not come.) They are actually sweet, but scared of us. If there was one that seemed ready to attack, it was probably scared. I have seen them act like a mad cat (hunched back and growl) when threatened by another animal. When I came in closer to stop them, raccon just ran away, I think it was relieved that I gave him a chance to get away. Raccoon in Oregon do not carry rabies, either
I had never seen a raccoon in our yard when we had a dog. He died about two years ago, that's when we started to see them visiting. They have the cutest babies!! SO yes, get a dog - even the smell of one in the yard will keep them out - Do you have sprinklers? Set them to come on at odd times during the night - they will learn to not come. Fnd out where they are getting in and fix the fence, or make it higher.
Or get one of those 6-foot diameter cheap hard plastic pools just for them! Then they will have their easy water to get to and leave your nice pool alone!
I just looked up herbs that raccoons hate - Hot peppers - garlic!! So start growing them near the fence where they are coming in, or sprinkle garlic cloves and/or hot pepper flakes on the ground?
Good Luck!