Check into your local laws too. Here if a dog comes off his property in a "menacing" manner and it's reported the dog will be labeled as a "potentially dangerous dog". The owner then has to relocate the dog outside the county, appeal the decision, euthanize, or pay a hefty fee to license the dog as a potentially dangerous dog. As a dog lover I do think it's harsh and there should be a warning first (unless the dog bit but he'd be in the dangerous category at that point anyhow) but it's nice to know the law exists. I have one dog (Australian Cattle Dog) that chases me on occasion and I'm sure will bite if he gets close enough. That's what he's bred to do so I don't fault the dog but I did let the owner know about the dangerous dog law.