It is very hard to hit a squirrel.
Would take a lot of practice .... and a lot of luck .... bad luck ... for the squirrel.
Not saying that I have tried.
But my wife thinks I have to slow to 2 mph if a squirrel is in the street.
If you simply drive down the road, not even trying to hit one, a fleeing squirrel will sometimes think twice and run back into your path!