In the spring of 1990, Doc O Mos, then a 6 year old bay 15.1 1/2 hand stallion, was discovered as the finest "Pleasure prospect" in the country. Previously a Working Cow Horse and never trained for Western Pleasure, Doc O Mos went under the guidance of Mike Moser and earned the titles of 1990 Senior Western Pleasure World Champion, Senior Western Pleasure Congress Champion, as well as Congress Western Pleasure Maturity Champion, all in the same year.

After his brief show career, Doc O Mos came to Double K Ranch and was retired to breeding. Beginning with his first foal crop, he became a leading Pleasure futurity winner sire. However, wins in Pleasure classes have been only a small part of his offspring's accomplishments. More than anything, they are very versatile show horses; their great mind, balance, movement, athletic ability, and trainability, create true all-arounders for the open, amateur, and youth rider. Doc O Mos' offspring have an average over 35 points each, for a total of over 6,000 AQHA points.

 Doc O Mos' success in the show ring and versatility as a sire was no accident. His sire, Reined Cow Horse World Champion Doc's Malbec (a sire of World Champions in Working Cow Horse, Reining and Western Pleasure) was by Doc Bar and out of Isla Tivio (an AQHA Champion by Poco Tivio). The Doc Bar x Poco Tivio cross became known as the magic cross that produced many of the finest show and breeding horses in AQHA history. Doc O Mos' dam, shown in Halter and Cutting and a futurity winner of over $8,000, was three-times King bred. She was by Thermo Sock, an AQHA Champion himself and a Reserve World Champion sire.

Doc O Mos passed away unexpectedly on March 8, 2002.