American Paint Horse Association (APHA) - http://aphaonline.com/ 

Pedigree Online All Breed Database - http://www.allbreedpedigree.com/ 

Hyperkalemic Periodic Paralysis Disease (HYPP) - http://www.vgl.ucdavis.edu/~lvmillon/hypp/hypp_facts.html 

 HYPP Testing - http://www.vgl.ucdavis.edu/~lvmillon/hypp/hypp.html