As some of you may know I have a 3 yr old Dun gelding who I pulled from a kill pen. I know nothing about his background at all, or his breeding. I am assuming he is atleast part qh (he is built like a tank). Anyways, should I test him for hypp?
That is always the problem with a grade horse (or one whose breeding is uncertain/unknown). I knew of a horse trader who disposed of a horse's papers because he was H/N and people were afraid of purchasing him.
At an auction I went to a few months back, there was a mare I was interested in. When I looked at her papers, she had Impressive in her background but had never been tested. I passed on the horse and her owner had no idea what I was talking about when I was concerned. Meanwhile when she came in the ring, the auctioneer read off her breeding but never mentioned the fact that she was untested.
And Bill points out a great concern. With the new rules, AQHA will not even register a horse that tests HH so now that horse will have no papers attached. Another thing is, AQHA now puts a comment on the papers (I think as of 07) that states the horse is a descendent of a known carrier of HYPP. But has Bill pointed out, it's easy to toss papers...
I would go ahead and have him tested just to be on the safe side. It would be a horrible thing if he has it and falls with you someday when he has a sudden onset fit. It would be much better to know for sure rather than to always wonder.
In agreement with all above. Also, if your horse ever does tie up or have a muscular problem of any kind, the first thing the vet will want to do is test so if you already know the status you'd be that much closer to finding a diagnosis. Knowledge is power, so why not arm yourself the best you can? When you pull the mane hairs, make sure to get roots!
I'd get him tested, best case scenario you are now reassured that's he's good to go and you don't have to ponder on whether he might carry it. Never hurts. Especially for a horse you know nothing about, I'd have it tested for anything, that way you don't have to worry about accidentally infecting another horse with something either. Too many pro's against cons. :3