The American Paint Horse Association (APHA), now the second largest equine breed organisation in the US, has endorsed the American Horse Council's national welfare code of practice.
APHA executive director Lex Smurthwaite said the association is and always has been committed to the humane and proper treatment of all horses.
"By supporting and endorsing the code of practice, APHA's leadership has taken that commitment to an even higher standard. We are pleased that the American Horse Council has provided a vehicle for all associations to join together to see that the welfare of our horses continues to be our primary concern."
Currently, American Paint Horses are being registered at APHA's Fort Worth, Texas, headquarters at a rate of more than 35,000 horses each year.
It has registered more than 958,000 horses in 59 nations and territories since it was founded 47 years ago, and now serves about 85,000 active members around the world.
It is a non-profit organisation that prides itself on community involvement and educating the public about the beauty and talent of the breed.
Other organisations to endorse the code include the American Association of Equine Practitioners, the American Quarter Horse Association, the Kentucky Thoroughbred Association, the National Thoroughbred Racing Association, the US Equestrian Federation and the US Trotting Association.
The code outlines in generic terms what it means for an organisation to be committed to the responsible breeding, training, care, use, enjoyment, transport and retirement of horses.