Detectives later found that Mr. Robinson had been shot twice, once by the officer and once during the struggle; he was pronounced dead shortly afterward. “We believe one of those bullets is going to come back to his own gun,” Mr. Browne said.

The name of the police officer who fired his weapon, a 26-year-old with about five years on the force, was not released. The shooting, like all involving the police, is being investigated by the department.

For Officer Tieniber, meanwhile, the media attention he and Bear received Wednesday was unexpected and a bit overwhelming: five television appearances, several radio interviews and a throng of reporters’ notebooks filling with his every word. “I was just doing my job,” he said, later confiding that he had thought the police shooting would divert attention from his story.

For his part, Bear stoically bore the regular tugs at his jowls as camera operators and inquisitive fellow officers leaned down to get a look at his cracked canine teeth. “It’s a little sensitive,” the officer said, inspecting his companion. The dog was expected to get caps for his broken teeth — four in all — next week.

“Everybody’s worried about his teeth; how’s your hand?” a lieutenant asked the officer, whose wrist, sprained during the confrontation, was wrapped in an elastic bandage under his dress blue jacket. (Bear wore his usual uniform: a badge, No. TK-27, dangling from his collar.)