Back ON topic, I also recommend a Remington LT-20. Widely available used and Youth stocks pop up all the time on eBay and other places as kids get bigger. I have started several ladies and youngsters - including two daughters - with mine, with overall excellent results. I have an LT-20 Magnum, but with two extra barrels and an extra stock or three it's a real go to gun.
There are other good gas autos available, including Berettas, that are available, but many have aluminum receivers and don't tame recoil as well, and none are as widely available used in excellent condition as an 1100.
Pit Bulls have, like it or not, become favorites of dog fighters and wanna be tough guys and thugs, and they want a mean dog. Think it enhances their image. And so every time you turn around you read where some Pit Bull mauled a kid. Probably happens with every breed, even Labs, and lots of times the kid probably deserved that and more, but the news people are going to jump right on any Pit Bull story. Like a traffic accident fatality versus a shooting. I think a large portion of the Pit Bull gene pool has been screwed up by the bad guys, and I wouldn't have one, but if you love yours I can understand that too. My cousin is one of the great Pit Bull champions, but she about had a fit when her son was looking to get one around her two little grand kids. Hypocrisy of the highest order. I told her to tell him to get a small dog so when it inevitably bites one of the little spoiled brats it will leave a smaller scar.