I searched here and many other places to see if I could find any definitive answers and I can not...Does anyone know of a study that shows Stringhalt is hereditary or not? Many people have opine that it is and that it is not but there seems to be not medical evidence supporting either side of the argument readily available.
Specialized Equine Rehabilitation, Reproduction, and Fitness in the Wine Country of Northern California
I'm interested to see the responses to your question, I've never heard of it being hereditary. We've had a handful of horses with stringhalt over the years and have generally found it to be related to injury (or back issues). I heard about a group of horses in Australia (I think?) where they proved it was diet-related in that particular herd, but have never heard of it being hereditary.
The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, "You know, I want to set those people on fire, but I'm just not close enough to get the job done".