Methinks anything coming out of a shotgun at close range will do the job. It's the follow-up shot to the head at close range that closes the deal.
I've taken down Staffordshire Terriers with a wrist-rocket and fishing weights (former paper-boy in a bad neighborhood).
Good-Grief! I thought I was the only former paper-boy to dispatch a dog! Mine was a German Shepherd, and it chewed my right leg for a week, and when the owners refused to contain it, I used a 'Bolo' on it, and dragged it a mile away from their house, killed it with my .22 Remington, and threw it in a ditch.
I think I was about 11 years old at the time, and in a farming community, if a dog will attack a paper-boy, it'll probably attack small children, so nobody bitched about the loss of the dog, not even the A-RABS that owned it!
I was kidding about the A-RABS, but not anymore. Stay well and vigilant, Orion....FRegards