The fighter rushed to the aid of Victor, a three-year-old Belgian Malinois, who had suffered a seizure and stopped breathing.
And the soldier carried it to safety and began giving mouth-to-mouth resuscitation in a desperate attempt to save its life just as his team had cleared a suspected Islamic State compound in Iraq.
After around 40 seconds, the canine began to cough and almost immediately got back on its feet.
“There was an explosion and when the dust cleared Victor was lying on his side and was unresponsive,” a source told Daily Star on Sunday.
“Everyone thought the poor thing was dead, but Victor is a very gutsy animal.
“As soon as he was up and on his feet he wanted to get back into the fight. It’s as though he was saying, ‘Payback time’.
“He was very lucky not to have suffered shrapnel wounds as that would have been a different story.”
SAS dog handlers are taught animal first aid and treat animals wounded in action as though they are treating a fellow soldier.
At least four SAS dogs are believed to have died on operations in recent years.
Belgian Malinois are a favourite among special forces units all over the world because of their intelligence, strength, stamina and courage.
Known as Malis, they are trained to attack enemy fighters and help in house clearing and urban warfare.
The special forces dog handlers are all trained members of the SAS who volunteer to work on the unit.