If there is any chance I would test, a mare at my farm is N/H and she's doesn't hold all that much muscle on her so you never know. Better to test now and get her on the right track feed wise, than have her have an attack. Posted via Mobile Device
Kenny, until she is tested, just be sure to feed a low potassium diet. Senior's feed is low. I had inquired to various feed companies prior to acquiring and N/H. If you google foods for hyperkalemia, it lists from high to low foods with potassium. Carrots, apples and bananas are right up there, so for now avoid feeding these as treats. Any horse whether HH or N/H should be out on pasture as plenty of movement is doubly important for them. It is best to offer loose salt, pickling salt with a little iodized. Horses ingest much more loose salt than from a lick which creates a sore tongue.
I don't know her HYPP status I just got her yesterday, the lady I got her from didn't think she was positive but I'll get her tested to be sure. As far as having a wasp waist I think it's because she so under weight.
One thing I did find on her that I'm not sure about is like wind puffs on her hips they are on both sides, swelling areas that fill like they are full of air they don't seem to be bothering her, the one on her left side is bigger.