A New York City tattoo artist, known as Mistah Metro, drew a firestorm of criticism after bragging on Instagram that he tattooed his dog while it was under anesthesia. (Instagram via New York Daily News)

A New York City tattoo artist, known as Mistah Metro, drew a firestorm of criticism after bragging on Instagram that he tattooed his dog while it was under anesthesia. (Instagram via New York Daily News)