Dr. Cothran does this testing. He started at Kentucky University and took the test with him to Texas A&M.
It costs $25. Typically done for mustangs but I recently asked about other grades and I was told that yes they will test for those too. I believe you need 35 mane or tail hairs with the roots still attached.
Interesting. I am going to look into this! After a reasonably extensive search and contacting people, I could not find any breed dna testing for my needs, which seemed really odd since it is available for quite a few dog breeds.
I have nothing against dogs, mind you, but w/o horses this country would not be on the map.
It is available for the so called spanish mustangs, yes..but I couldn't locate anything for a specific breed w/o matching those on a given registry - which is of no use to me. I am 99% certain I am correct about a specific breed in my mares lineage...but I want to remove all doubt.