I find it kinda interesting that NO ONE has gotten irate about you shooting this pitbull.
what would the responses be if it were a black lab or terrier...I got fried on this forum for shooting my own dog with an old daisy pellet gun!
About the #4 shot, I would go bigger for a humane kill. one of my dogs (scruffy) got loose and neighbor shot him with #4 at about 30 feet.
I know this because he called to tell me it wasnt a clean kill and did i want him to finish the job.
I went over with my usual carry and the dog didnt look that bad. dug out 6 pellets and a shot antibiotic at the vets and good as new.
he has no interest in jumping the fence any more!
Look: We've answered the question of load effectiveness, and given what seems like rational advice, and then wandered off into the world of dogs as dogs--and, generally speaking, pit bulls aren't mentioned as hunting dogs, usually. Not on quail, pheasants or ducks, anyhow.
For a little kid, it doesn't take a heckuva lot of dog to be dangerous.
And some dogs fight above their weight class. I once saw a Chihuahua kill a Great Dane.
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Stuck in his throat...