Military working dogs like the one who chased down ISIS's leader always outrank their handlers. Here's why.

Handlers have to be able to communicate what their canine partners are "telling" them, and to know without a doubt that the dog will listen to him or her.

"There's no doubt about my dog: Number one, he will protect me. Number two, he will find a bomb," Sgt. 1st Class Regina Johnson told the Army in 2011.

By and large, military working dogs are treated as regular US troops would be.

Unfortunately, there was one period where military working dogs were left behind in a combat zone — in South Vietnam, during US troops' hasty withdrawal there.

Prior to 2000, military working dogs were also euthanized after their service was finished. Military working dogs can now be adopted to civilians once their service is finished.

Cairo secured the perimeter of bin Laden's compound in Pakistan, and, should the al Qaeda leader have proven difficult to find, Cairo would be sent in after him.

Upon hearing that Cairo was involved in the raid, former President Barack Obama said, "I want to meet that dog," according to an account in The New Yorker.

"If you want to meet the dog, Mr. President, I advise you to bring treats," one member of the SEAL team jokingly advised the president.

Dogs and their trainers go through a 93-day training program to cement their skills and gain practice as a team in real-world scenarios, according to the Army.

Only about 50% of the dogs the military procures to become military working dogs are actually suitable for the job.