Ran into a [sic] animal?
You swerved to save a squirrel? I know that's what it was...coz if a dog or cat...a cow, deer, or bear, we would have heard about it. That you don't want to tell us is good though.
From this, I know that you know you should've just kept going...and you should have. I'm sorry, but some things you just have to have 'programmed' in your head when driving.
I had a raccoon commit suicide by e36...cost me $600...and it would have been more if my bumpers needed paint, but they came from factory with the gray matte finish that was OE for my '92 (RIP).
Anyway, you just need to have that as an instinctive reaction...there are some things you just need to be prepared for all the time on the road...low odds things. But srs, since this was such a reactive move of yours, consider yourself lucky that you didn't slam into a tree, over ravine, tumbling end over end and bursting into flames like in the movies.
Be prepared...you just have to run over little animals...even really cute little ones.
Rinse undersides afterwards.
Doug