A black Labrador who became a national canine hero after burrowing through white-hot, smoking debris in search of survivors at the World Trade Center site died yesterday after a battle with cancer.

Owner Mary Flood had Jake put to sleep yesterday after a last stroll through the fields and a dip in the creek near their home in Oakley, Utah. He was in too much pain at the end, shaking with a 105-degree fever as he lay on the lawn.

No one can say whether the dog would have gotten sick if he hadn’t been exposed to the smoky air at ground zero, but cancer in dogs Jake’s age — he was 12 — is common.

Ms. Flood had adopted Jake as a 10-month-old disabled puppy — abandoned on a street with a broken leg and a dislocated hip.

“But against all odds he became a world-class rescue dog,” said Ms. Flood, a member of Utah Task Force 1, one of eight federal search-and-rescue teams that desperately looked for human remains at ground zero.

Anguished New Yorkers honored the dogs.

On the evening of his team’s arrival, Jake walked into a fancy Manhattan restaurant wearing his search-and-rescue vest and was promptly treated to a free steak dinner under a table.

Ms. Flood said Jake’s ashes will be scattered “in places that were important to him,” like his Utah training grounds, the rivers and hills near home where he swam and roamed.