First off, be careful replying here. Everything on the computer lives forever, and 2nd amendment rights have been under attack for long enough that folks need to consider a response here as a form of registration. My 2 cents, but I've been a database guy for 10 years and a nerd for 15, and know where the tapes are..... :^(
That said, I've already put myself on lists many times, so I'll speak up. I leave in a meadow that is 5 acres away from PIke National Forest West of Monument, Co. I spend time some portion of every other day on the trails in the woods near me, on horses, bikes, and walking. Growth is a huge issue around here, and the trails are seeing a corresponding (and then some) surge of use. We've seen aggressive bears, mountain lines, and coyotes. Lately, with a huge amount of rain on the front rain (drought still in CO, but not so much here), mice are up. Coyotes are up huge, and they are aggressive.
I was on a young horse, ponying another young one, with a 90lb dog and 40lb dog, and had them run at me 5 times, tackle a dog, and come back after I urged a horse on to chase them a bit (face dogs, and run at them, coyote or not, horse or bike, confront and chase them). We've also lost 2 cats that made it through 8 years here, then within 3 weeks the Coyotes figured something out.
I realize I signed up for wildlife here, and would never shoot anything within those parameters. I have no kids, so my dogs/horses/cats are a sad bit too much in that role, but I still realize the order of things that are important, and what I signed up for living here. However, I also know the difference between a coyote that got my cat, vs one that tackled my dog with me yelling and charging on TWO horses. The latter is going to approach families and kids. It may be our doing moving or hiking or otherwise encroaching, but what is done is done and some aggresive coyotes, lions and bears must go.
For an auto, a Kimber . 45 is what I carry (bike - some of you may never look at a biker's camelback the same!). Go Kimber for high quality auto, but go . 38 revolver, or a touch less if ya need, for what your wife is comfortable. Don't even consider it without training, and practice to keep your training an safety skills up to date. Take IPSC courses, get certified, and shoot a few matches. If no time for training, get a noisemaker of some sort. The local farmers keep coyotes out of melon fields, etc. , with timed bird-bomb type stuff.
sorry for the long reply,
jon.