In Texas it is against the law to shoot a dog with a orange REFLCTIVE collar or you can go to jail!!! My very close friend is in animal control and has actually witnessed a person going to jail for it...orders not matter if it's on your property it's illegal
I asked a local police officer about shooting a dog on your property to protect your livestock, etc.
He said just shooting a dog for being on your property is a no no but shooting a dog to protect your property, livestock, chickens, cats, dogs, whatever is legal.
Sounds like it would be hard to prove otherwise if a man SAID the dog was after something and there were no eye witnesses. If it ever happens just gotta hope they were a dumbass and admitted to doing it out of malice.