That's where I was. I have a friend who carries a Judge when taking his dog to the park (not a typical city park, more like a farm that was donated to the State in a will). I wouldn't want to kill someone's dog merely because the owner is too negligent to keep it under control, and maybe rubber buck would break up a fight- may be useful when the aggressive dog is approaching your dog, or even when both dogs are actively fighting (stray ball doesn't kill your dog too).

Nobody said you cannot carry another pistol for lethal purposes.