I was just wondering if everyone on here knew about the horse bred Impressive....I didn't.. and just sold a horse that has it in the bred...now the Lady is going crazy on me....I have done a lot of reading on this in the last few days....and this is a scary thing....so I just thought I should let people know!!!!!!!!!

Its not a good disease but it can be managed with good practices, exercise,feeding[nutrition] if the horse is a carrier on one side. If the horse you sold has papers depending on age at the very bottom under the owners name should be 1-2 sentences that will say this horse is known to have an ancestor which traces back to Impressive, then it will either say it is recommended that he/she is tested or that they are tested and the results>N/N that they don't have nor carry the gene N/H that they are non systematic but do carry the gene H/H that they are both systematic and carry the gene.
Regardless of the results it is in everyones best interest not to breed horses that have that lineage[in my opinion] There are enough good quality horses out there that there really is no reason to breed to what is know to have a genetic defect.
Now as far as the sale, that is a moral issue, If you sold the horse as a breeding animal the buyer being a responscible breeder should have been aware of the HYPP factor.
If sold as a riding animal, if it is H/H it can have seizures and really is unsafe to ride, in good faith you should take it back, although an honest mistake, better safe than sorry and I'm sure you would not want to be responscible for someones injury.

I've owned a few Impressive bred horses. But personally I wouldn't breed an Impressive bred horse that was N/H or H/H.
I do still have an Impressive bred mare with the linage. I researched her pedigree and found it's 6 generations back so she's got what- a few drops of Impressive's blood- that doesn't bother me.

As long as the horse doesn't carry the problem, N/N horses don't scare me. I've found every Impressive bred horse I've ever been around or owned were all very smart, VERY quick learning, and willing horses. I'm not run off as long as it's a neg. result in the HYPP test.

As long as the horse is N/N then everything is ok. All Impressive bred horses should have stated on their registration papers what they are N/N, N/H, H/H. A large number of horses have an Impressive bred horse somewhere in their pedigree. My dad has a paint horse that back on his damn side is a mare that is related. He also has a little reining mare that also is an N/N. He was a nice looking horse and was a very popular stallion that has offspring in the AQHA, APHA, and in the Appy Breed. The AQHA has just recently passed a rule stating that any horse that is (if I remember correctly) N/H or H/H is unable to be registered with the association. IF the horse is N/N then you don't have anything to worry about and neither should the person who bought the horse. Also, my opinion is that the buyer didn't do his/her homework. I always look at pedigrees when I am buying a horse.
If you honestly didn't know then at least you are now educating yourself. So do you know what the horse is?

As long as the Impressive bred parent (or grandparent) was tested HYPP N/N, then there is nothing to worry about. The test for it is only $50 though, so the new owner can easily put their mind to rest. I would offer to pay for the test if I were you, and offer to take the horse back if the test comes back N/H (positive for HYPP).

"dam* side? LOL just messin' with ya. I know what you meant