In 2016, following a 6.2-magnitude quake in the town of Amatrice, Koas dug tirelessly for survivors alongside rescue workers.
The three-year-old dog had also assisted rescuers in the aftermath of another quake in Norcia in October 2016.
Police are now investigating the death. Alongside his owner, Fabiano Ettore, Kaos was among the first to arrive at the scene and worked relentlessly over the next few weeks to assist rescue workers.
Fabiano Ettore wrote a heartwarming tribute to his dog Kaos.
Less than an hour later, Mr Ettore posted a photo on Facebook of his dead dog.
"Keep up your work up there, keep looking for the missing, and saving lives", the post said. You were a loyal friend.
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Three hill towns in central Italy, including Amatrice, were destroyed in the quake on August 25, 2016 and the death toll was 299 people.
The heaviest loss of life occurred in the town during the magnitude-6.2 natural disaster, which struck in the early hours of August 24, 2016.
Rinaldo Sidoli, a communication manager for Animalisti Italiani said: 'They killed the hero who, together with rescuers, dug with his four paws during those dramatic hours to find survivors of that massacre.
Italian lawmaker and business executive Michela Brambilla told the Associated Press that she hoped Kaos's death would encourage members of Parliament to pass a bill against animal cruelty that she proposed earlier this year.
According to a 2012 study that looked at data from the Poison Control Center of Milan, a majority of animal poisonings in Italy involve dogs.
"Kaos's death has touched the conscience of the Italian people", Brambilla said. Three cabinet ministers also joined the call for a crackdown.