Case law... ok, kid, here's your final lesson for the night. Take notes.
Not every event in life is or has yet been, made into a court case on which to base a "case law" to reference.
Sorry to break it to you. Not every crime commited gets into a court.
Not every case that does make it into a court becomes some kind of Supreme Court ruling or other.
Not every event in life is documented, or becomes a link on the internet to cite.
I gave you the Statute to reference that covers the law on the matter.
From there you can do your own research, if it's important enough to bother, instead of crying about everyone telling you it's not a good idea for a number of reasons.
You can feel free to ask a lawyer or a leo, or better still -contact the ASPCA, the humane society, etc. Any of them will not hesitate to lay out precisely what I told you, almost word-for-word what the law is on the matter, and can probably point you to any "case law" available on the issue.
In fact, I encourage you-and all those yahoos in the shoot the scary dog thread to do so. I assure you, they will not like the answer,either.
Since you are either too lazy to do so yourself, or-being a kid, lacking in the know-how to do so, Ill provide you the links:
http://www.aspca.org/
http://floridahumanesociety.org/
I can almost guarantee you they will tell you exactly what I've said in here- (even though Im sure they will be politically correct enough to avoid calling you a moron over the phone, at least until you hang up..)
Why am I so sure of this? Because, from personal experience (no worries kid, if mommy ever lets you out of the house some day, you'll get some of your own) of my own situation here, I inquired about it (not putting down of a dog, but of the shooting of one as in the other post). Im very intimately familiar with this particular Statute, because it is precisely the charges that will be pressed on the persons who killed my dog, the dog of another neighbor and 2 of their cats.