The dog is a rescue. He was dumped from a moving car right in front of Dr. Katz’s office. Pete, the vet technician, was on the stoop, smoking a cigarette, when it happened. Dropped like a sack of potatoes, Pete told Dr. Katz. Pete picked up the dog—a mangy black-and-white with deep dark eyes—and brought him to Dr. Katz, who was finishing up a Rottweiler with glass in its paw. The dog is a mongrel—a Lab and something-else mix. Maybe shepherd or border collie. Dr. Katz isn’t sure. A gentle dog. About two years old. He is mostly white but with a black tail and black patches, including one that encircles his left eye. The minute Roger Katz lays eyes on the dog he knows he’ll call him Pirate.