Feel Horrible

I was sitting in my office doing the work at home thing when the wife calls from downstairs if I had my BB gun handy.  She said the squirrel was back ravaging the bird feeder.  I went into the garage and grabbed the pump gun instead of the "gentle" Red Ryder Daisy gun I typically use.  I pumped it up, aimed out the door, and fired.  I aimed for his butt but hit the squirrel mid back...paralyzing his back legs.  I immediately felt very guilty for wounding the animal and went outside to finish it off humanely.   The squirrel drug himself to the fence, climbed it, and got away before I could take care of it.  I feel horrible.  The little guy just wanted some food.  I wounded him, grievously, and now he is out hurt.  If I had killed it outright I do not think I would have felt like I do, but I wounded it and now it suffers.   Damn I feel horrible about it.