External Identification. Outfit your dog with a collar and ID tag that includes your name, address, and telephone number. No matter how careful you are, there’s a chance your companion may become lost—an ID tag greatly increases the chance that your pet will be returned home safely. The dog’s collar should not be tight; it should fit so two fingers can slip easily under his collar. Read a fun fact about the History of Dog Collars below.
Spiked dog collars were invented in ancient Greece and were originally designed to protect dogs throats from wolf attacks.
SRC: Learn more about the history of dog collars at: www.dogcollarsboutique.com/A-History-of-Dog-Collars-sp-17.html?SSAID=314743