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....