Still have my old Blue Streak from about, well, too many years ago.... Put a significant dent in the local starling population and other related carnage. Don't forget to put a drop or two of air gun oil into the intake hole on occasion and it'll last a long time. That said, I'd agree with Dogfish and use it both as a reason to spend some time with your son and to make sure you don't have local LE show up at your door because of wayward projectiles.

Although not for the purposes of a cat, my old Feinwerkbau 124 has been handy the past few days for the squirrel that keeps raiding my walnut and hazelnut trees