Can't wait to see you in 2026!
August 29, 2026 - 7am - Arapahoe County Fairgrounds
Mark your Calendars!
4th Annual RexRun
At the heart of the 4th Annual RexRun for PAWSitivity is a powerful purpose: to inspire hope, promote mental well-being in children, and strengthen the bond between our community and the K9s and Officers who protect it.
Join us for a day of fun for the whole family
On September 6, 2025, at the Arapahoe County Fairgrounds, we're bringing together families, law enforcement, and local businesses to create a safer, healthier future - one step at a time!
RexRun For PAWSitivity 5K Trail Run/Walk
Join us for a fun filled day focused on physical & mental wellness, family, fun and our furry friends.
Dog & Family Friendly Activities include:
- 5k trail run
- 5k trail walk
- 1 mile kids run
- Kids obstacle course - Sponsored by FitRepublic Southlands
- Pancake Breakfast - Sponsored by FOP Lodge 31
- Silent Auction
- Live Auction
- Vendor Fair
- Therapy K9 meet & greet
- Police K9 demos
Have your k9 companion sworn in by the sheriff
Do you have a loyal and honorable companion at home who dreams of being a Police Dog?
At RexRun you can fulfill their very dream. A package complete with a badge, personalized certificate and live swearing in ceremony with Arapahoe County Sheriff Tyler S. Brown!
Don't want to run? be a volunteer!
Rex can't do this alone and our Volunteers make Race Day come off without a leash!
Sign up to be a volunteer and help us shape this Pawsome day for everyone involved. Volunteers receive a commemorative race day T-shirt and pancake breakfast for their assistance.
Deputies and K9s we support
Deputy John Gray & K9 Rex
Deputy John Gray and Rex are Arapahoe County Sheriffs Office School Resource Officers assigned to Littleton Public School District elementary schools.
Rex is a black Labrador Retriever, who is a trained and certified Therapy/Explosive detection/Tracking K9. Rex loves spending time with people, loves to play and most of all loves to work!
Follow Rex on his Instagram @Arapahoe_Rex_SRO.
Deputy Adam Nardi & K9 Riley
Deputy Adam Nardi and Riley are Arapahoe County Sheriffs Office School Resource Officers assigned to Cherry Creek Public School District. elementary schools.
Riley is a black labrador retriever, trained and certified Therapy/Explosive detection/Tracking K9. Riley loves to play with his uncles Rex and Zeke.
Follow Riley on his Instagram @Arapahoe_Riley_SRO
Deputy Travis Jones & K9 Zeke
Deputy Travis Jones and Zeke are Arapahoe County Sheriffs Office School Resource Officers assigned to Littleton Public schools at Newton Middle School.
Zeke is a black Labrador retriever, who is a trained and certified Therapy/Electronic detection dog. Zeke likes to hang out with his brother Rex and work for treats .
Follow Zeke on his Instagram @Arapahoe_Zeke_SRO.
Deputy Candace Gray & K9 Bear
Deputy Candace Gray and Bear are Arapahoe County Sheriffs Office School Resource Officers assigned to Cherry Creek Public School District Elementary Schools.
Bear is a chocolate Labrador Retriever, who is a trained and certified Therapy/Explosive detection/Tracking K9.
Follow Bear on his Instagram @Arapahoe_Bear_SRO
Deputy Drew Matthews & K9 Otis
Deputy Drew Matthews and Otis are Arapahoe County Sheriffs Office School Resource Officers assigned to Byers High School/Deer Trail High School.
Otis is a black Labrador Retriever who is trained and certified Therapy/Explosive detection K9.
Follow Otis on his Instagram
@Arapahoe_Otis_SRO
Sheriff’s Office Patrol K9 Unit
RexRun and Back the Blue K9 Force also support the Patrol K9 Unit at the Arapahoe County Sheriff’s Office. These dedicated K9s and their handlers patrol communities in Arapahoe County, helping keep citizens and deputies safe.
Nuke, Bodhi, Rust, Voq and our newest K9, Grimm are all trained in a variety of disciplines to include apprehension, tracking and finding drugs, explosives and other evidence. They also have a brand new cousin currently in training who we cannot wait to introduce!
Follow the Sheriff’s Office on Instagram @arapahoeso
We strive to teach our youth empathy and compassion through the role of a school resource officer and are more effective in this mission everyday with the help of Rex, Zeke, Riley, Bear and Otis.
Deputy John Gray