George H.W. Bush's service dog, Sully, stayed faithful to his owner by laying beside the former president after he passed away.

RELATED: Sully visits former president George H.W. Bush's casket

Sully is just one of thousands of service dogs protecting their owners and making life easier on a daily basis.

Ruger works a 24/7 job. He's David Ballengee's service dog.

"He keeps all my secrets," said Ballengee, a veteran from Perry.

Ballengee has a minor traumatic brain injury. He says it causes him to have short term memory loss, nausea, migraines and stress easily.

Ruger's job is to help him remember the things he forgets.

"I can actually put him on command to sniff out my wife, and he can find her in the store we're in," said Ballengee.

Ruger calms Ballengee's stress with lots of loving.

"'I know that petting me makes you feel better, and having my body leaned into makes you feel better,'" Ballengee said.

Ballengee says he was on 16 different medications before Ruger came into his life, and now he's on two.

"He can literally smell the chemical differences in my body and alert me to needing to drink water, needing to eat food, needing to take a rest," Ballengee said.

It's an inseparable bond between a man and his best supporter.

"Ruger is with me at any time, he helps to keep me calm, chill me out. I've got a buddy with me that will never leave my side," Ballengee said.

The best part of Ruger's job is he gets paid with infinite petting and belly rubs.

Ballengee says he couldn't live life without him.

"There's somebody here whose sole purpose in life is to help me, to take care of me, to be there for me," Ballengee said.

Ruger is a faithful supporter of five years now, but also an everlasting friend.

Ruger is about to retire as a service dog. The normal work span of a service dog is about 5 years, because of the work load they endure everyday.