A bomb-sniffing combat dog who earned two Bronze Stars during two tours in Iraq in a Special Operations Forces unit was shot dead by a bicyclist in Wyoming who felt the hero canine was a threat.

Mike, a nine-year-old Belgian Malinois, was killed in the small town of Powell while his owner and service partner, retired Army Ranger Matthew Bessler, 43, was hunting in the Bighorn Mountains.

A friend was staying at Bessler's house and was watching Mike and Bessler's other dog Ziva when the veteran canine somehow escaped and encountered the cyclist in the area outside of the home.

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Retired Army Ranger Matthew Bessler (right) came home to find out his combat partner Mike (left) was dead

The combat-turned-service dog was shot and killed by a bicyclist who felt threatened in Powell, Wyoming

Mike helped his owner deal with his PTSD symptoms and also took Prozac because he suffered from anxiety

There were no witnesses, but the Powell man told police he used his bike to shield himself from the attacking dog but finally shot the animal with a revolver from a distance of five to ten feet away.

The combat-turned-service dog had transitioned from helping his owner on the battlefield to aiding him with the fight against symptoms of post-traumatic stress syndrome (PTSD) at home.

Mike and Bessler earned two Bronze Stars in Iraq

The 20-year veteran also helped Mike as well because the service dog was also dealing with PTSD symptoms and had even been prescribed Prozac to calm his anxiety, according to the Army.

Bessler does not believe the cyclist's claims that Mike, who was shot in the backside by the biker's bicycle-mounted holstered revolver, was acting aggressively enough to warrant the shooting.

He plans to find out exactly what happened to his beloved dog, the Billings Gazette reported.

Bessler said: 'He has his story.

'I know my dog. I have my story.'

The retired Staff Sergeant added: 'I would like to take a civil avenue to go after him - the gentleman that shot him - because Mike was a retired military officer.

'I mean, it's not just a wrongful use of force.

'It's way too soon. I mean, it's every time I see him everywhere that I go.

'Because he was, he was with me almost everywhere I went and he was always playing and he was always... he always wanted to play and everybody loved him.

'Everybody could pet him.'

The Park County Sheriff's Office has not cited the 59-year-old cyclist, who was not injured in the incident, for any wrongdoing, according to the Powell Tribune.

Park County Sheriff Scott Steward said: 'Essentially, if you feel your life is in danger or threatened by an animal, you can act against it.'

Bessler does not believe the cyclist's claims that Mike was acting aggressively enough to warrant the shooting

The cyclist was not injured. A campaign to give Mike a full military funeral and burial has been created online

Bessler seen playing with his other dog Ziva (left) and Mike (right) at his home in Powell in June of 2015

What, if anything, will happen remains unclear, but a GoFundMe account for Mike was created.

'We are a community coming together to mourn the loss of a brave military service dog, who deserves the honor to be laid to rest with a military funeral and burial,' according to the account.

'This soldier was found fatally wounded by his owner and friend Matt Bessler (also a military war veteran) after Matt returned home from a hunting trip.

'Major Mike is a former military combat dog that had served two tours of duty in Iraq.

'Please help us fund a funeral that will do this military war veteran the respect he deserves.'