I wrote an article about PSSM recently: here's a paste of how to avoid buying a horse with PSSM.
Over 10% of Quarter Horses are affected for PSSM1. Over 60% of Percherons and 90% of Belgian Draft horses are affected. The American Quarter Horse Association requires genetic testing for PSSM1 and four other genetic conditions (GBED, HYPP, MH, and HERDA) when a Quarter Horse is registered.
Breeds affected by PSSM2 include Dutch Warmblood, Swedish Warmblood, Hanoverian, Friesian, Selle Francais, Westfalian, Canadian Warmblood, Irish Sport Horse, Haflingers, Gerdlander, Hussien, and Icelandic horses. Many other light breeds have also been diagnosed with PSSM2 including Morgans, Standardbreds, Thoroughbreds and Arabians, as well as performance (vs halter bred) Quarter Horses.
First ask if the sire and dam were tested for PSSM. If the seller can prove they are negative, and not carriers, you don’t need to test for the variant (type 1 or 2) they tested for.
If the sire or dam were not tested, decide if the horse’s breed is likely to be more prone to PSSM 1 or 2. If you’re looking at a Quarter Horse, at least test for PSSM1 for example.
The PSSM1 test is relatively quick and easy - a hair test, about $40, and takes a few days from
http://www.animalgenetics.us/equine/gen ... e/PSSM.asp For PSSM2 I’m sure no seller would agree to a muscle biopsy on a sale horse, but there is a hair test for PSSM2 from
http://equiseq.com/ Unfortunately, it costs $249 and takes at least 2 weeks, by which time many horses are sold. What can a buyer do?
First, check bridgequine.com to see if the horse’s pedigree contains carriers. Also ask the Facebook group PSSM Forum if they can I.D. any suspects.
If the horse is in full time work, and hasn’t shown any symptoms, the risk decreases. If not, you may wish to ask the seller if you can grab a hair sample the first day you see the horse, overnight it for testing and hope the wait isn’t too long.
For shivers, the only diagnosis is by video - I suggest you watch the videos available on YouTube or the presentation Dr Valberg did, so you can learn the signs. Asking your vet to perform a neurological exam as part of the pre purchase exam on any horse is advised.
https://www.myhorseuniversity.com/singl ... -Explained