To honor his service, the Rancho Cucamonga Fire District held a public memorial for the yellow Labrador retreiver on Saturday.
Denali's ashes were placed near his service jacket and his badge at the fire district's Jersey Station.
A plaque with Denali's portrait will soon be hung on the fire district's "legends" wall of fame at the station.
A replica of the plaque was unveiled at the ceremony.
Denali served the department for several years before he died. His specialty was finding tell-tale signs of flammable liquids for arson investigators.
He was the third of three accelerant-sniffing dogs owned and cared for by longtime Rancho Cucamonga arson investigator Susan De Antonio, who along with Denali, retired in 2009.
Denali died in October last year after complications from megaesophagus, a condition in which food enters into the lungs, De Antonio said.
Over the course of his career, Denali investigated dozens of fires in Rancho Cucamonga, and mutual aid fire scenes in the surrounding Inland Empire region. In total, he investigated over $9 million in losses.
"This is truly the end of a very important era," De Antonio said. "A young person might visit the station one day, and might want to be interested in prosecuting and investigating arson," De Antonio said. "They might say, `I heard a long time ago, dogs used to be used for this.' Hopefully we'll get a canine team again."
De Antonio adopted Denali from Guide Dogs of America, when he was two. Denali was the last of three flammable liquid-sniffing dogs used by the department during investigations in the past decade. Two labs, Newby and Gator, also served the district.
Rancho Cucamonga Fire District chief Mike Bell said Denali and Susan offered much more to the community in addition to their work helping prosecute suspected arsonists.
"He and Susan were much more viable to the community in the way that they taught people about fire prevention," Bell said. "It was just so amazing how she was able to use the dogs in so many ways to touch lives in our community."
Reach Neil via email, call him at 909-483-9356, or find him on Twitter @InlandGov.