Cheyenne police are mourning the loss of a retired K9 officer who served the department for seven years.

"We are heartbroken to announce the passing of retired K9 Ruger," police posted on Facebook Sunday evening.

During his career, Ruger assisted the department's patrol division with sniff searches for narcotics, evidence, suspects, and missing persons.

He retired in 2019, having contributed to 545 narcotics searches, 35 apprehensions, and 124 arrests.

"Thank you for keeping our officers and community safe, Ruger," the post reads. "Our sympathy extends to K9 Ruger's partner, Officer Wellman, and his family."

RANKED: Here Are the 63 Smartest Dog Breeds

Does your loyal pup's breed make the list? Read on to see if you'll be bragging to the neighbors about your dog's intellectual prowess the next time you take your fur baby out for a walk. Don't worry: Even if your dog's breed doesn't land on the list, that doesn't mean he's not a good boy--some traits simply can't be measured.

Check out these 50 fascinating facts about dogs:

KEEP LOOKING: See What 50 of America's Most 'Pupular' Dog Breeds Look Like as Puppies