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It doesn't really make sense that one must intend to kill the animal. You'd think society in general would prefer a non-lethal approach such as electric fences if possible.
This is all I could find in the FL statutes:
http://www.leg.state.fl.us/statutes...ing=&URL=0700-0799/0767/Sections/0767.03.html
767.03 Good defense for killing dog.In any action for damages or of a criminal prosecution against any person for killing or injuring a dog, satisfactory proof that said dog had been or was killing any animal included in the definitions of domestic animal and livestock as provided by s. 585.01 shall constitute a good defense to either of such actions.
electric fences are legal as they are a physical barrier that is created with the intent of dealing a mild electric shock. Now, if you hook it up and boost the voltage to a degree that causes more than "normal" pain, then you would be looking at cruelty.
BB guns, on the other hand, are not designed to be used to kill things like dogs. The only outcome of using them is to cause lasting pain, IE bb stuck in the skin. That is what makes using them animal cruelty. So, yes, non-lethal is good if it is something INTENDED to be a non-lethal deterrent to animals. BB guns, paintball guns, etc are not intended for that purpose and are legally viewed as cruelty in most areas. So, the "he was killing my livestock" defense doesn't hold water if you follow that up with "but he's a cute widdle puppy and I didn't want to hurt him"
I am the one who drew the correlation to self-defense. Because, legally, the reasoning is the same. If you are willing to pull a gun, then you should be willing to use lethal force. You can't have it both ways - either the animal is a predator menacing livestock and causing damage or it is a cute widdle puppy that you don't want to harm.