I know that there are several posts concerning EPM, yet I did not see one that followed and answered the questions I have. Before I start, I want to state that we have contacted the Vet and have an appointment on Monday. Today my sister and I had a lady come out who practices Orthopathy on equine and canines. We had her work on two of our horses, a barrel horse and a trail / obstacle challenge horse. The barrel horse had been showing signs of discomfort and one hip looked higher than the other. The trail horse has had a mystery lameness that only presented itself at the walk when being ridden (Saddle fit was ruled out, x-rays on her front legs were done, a masseuse had worked on her). Turns out she had a shoulder out. When the Orthopathic specialist worked on the barrel horse, she started noticing symptoms of EPM. This mare has always been very sure footed and has never given us a reason to suspect EPM. One test that the lady did was apply pressure to the horse's poll. She immediately dropped her head. Supposedly this is a symptom, but I am not entirely convinced due to this mare being trained to drop her head to pressure. The next test was to apply pressure (quite a bit, if I may add) to the horse's back near her SI joint. She dipped her back, and that response and whatever the specialist might have felt (I'm not entirely sure if she felt something, this is simply my observations.) The third test was to push against the side of her hindquarters. The mare moved without resistance (again she was trained to yield) however she did stumble over herself a little bit. Her tail was then pulled first to one side and then the other. The mare was rock solid to one side, the other she struggled a little more to keep her balance. She then commented on the mare having muscle atrophy in her hindquarters and neck. I personally do not see it, but won't discount this. The mare had never packed much muscle, even when she is fit. The next horse, the trail horse, had obviously shown signs of needing chiropractic work done. My farrier (a rather experienced horseman) had previously tested the mare and thought her to be out in her poll and SI joint. We would have brought out a regular chiropractor but they all required 4-5 horses to make a farm call. Anyway, the Orthopathic specialist performed the same tests on this mare as the last. Again, this horse was trained to give to pressure on the poll. She lowered her head a little bit then shook it back and forth a little. She ducked her back when pressure was applied near her SI joint. She remained solid-footed when her tail was pulled, and her feet did not move when her hip was pushed, though her hip did shift with the pressure (I will draw pictures if this does not make sense). This mare has never had a great topline, she was in poor condition when I bought her as a yearling five years ago and even with my vet's help I could never get it to completely fill out. This mare has not been in regular work within the last several months, and has only been lunged maybe twelve times during that time frame, yet she is looking nice and is actually building muscle. She is a bit more on the klutzy side, usually have to get her attention before getting on or she may take a misstep. Always been like that, and I attributed it to her being rather narrow and ALL leg (no exaggeration, she is a literal t-post). She has never had an issue stumbling on the trail, in the pasture, or even in a deep sanded arena at any gate ( I have ridden her in each of these terrains in the past month, testing her lameness due to it only presenting when being ridden). Has no problems traveling out, performing lead changes, side-passing, or anything of the sort. Only had a light gimp at the walk. Now, I will end my novel with the addition that this specialist could not give an actual diagnoses due to her not being a veterinarian, but she did recommend that we either go ahead and treat them both for EPM or have the vet test them. I am somewhat skeptical, in all honesty, and would like to hear other's views on this. We are taking the horses to the vet, better be safe then sorry, but wouldn't the horses have given us some kind of symptom such as abnormal spookiness? Stumbling? Wouldn't the trail horse be exhibiting a decrease in muscle rather than an increase? And what are the chances that two horses present active EPM at the same time?