I agree with Tom's previous comments regarding the "kibble powered alarm" ... If someone comes to Johnson Manor they have three large hounds to get through. Should they be wearing cups and that not convince them, the talons of my evil wife. Last stand would be to go guns. Now, I have to check with the Mrs. on what gun will color coordinate with my pajamas but usually, it will be either a tuned 5" S&W 625, a SIG 220(both w/Win Black Talons) or a 4" S&W 629 (w/Win. 44 SP Silvertips) that was ported and tuned by the folks at Mag-Na-Port.
Long guns make sense and Erik is right when he says that a .223 will not penetrate anymore than many handgun calibers. My problem is that I don't have a .223 and since I already have a 22-250, I don't really need one. Grabbing my M1A Scout would be great if I defending my house from a platoon strength foe. My 375HH Sako if it were some pissed off bears. Given that I have 45 yards from my front door to the sidewalk and 50 yards from my back door/deck to the fence (and then a golf course fairway), a rifle does make sense for me. Since there is not likely to be an invasion to utilize my M1A and there are not any big bears in Oklahoma (but I hear there are flying monkeys like in the Wizard of Oz), the gun I would grab if stuff hit the fan and I needed to work outside would be my Winchester Trapper in 44 magnum. Works great in combination with the S&W 629.