The seven-year-old Belgian shepherd dog, or Malinois, was “killed by terrorists” when French special forces raided an apartment building in Saint-Denis early on Wednesday morning.
A Twitter user who paid tribute to Diesel said he had "died to defend our colours" while one police handler said it was "a little like losing one of our colleagues".
Police National tweeted:"Diesel, a seven-year-old Malinois, police dog for RAID [France's anti-terrorist police unit], was killed by terrorists in the ongoing operation."
The police spokesman said that dogs such as Diesel who are trained to assist on operations where there is a risk of explosives were “indispensable” to the elite unit.
The brave dog was reportedly the first to be sent into an apartment, which was used by at least six jihadis in the run up to the attacks, to assess the level of danger before they stormed it.