Originally Posted by upnover
Yep! Kind of crazy isn't it! I had heard that once but didn't really believe it (i've known tons of people who have used them and never seen a horse pass out!) but my vet has seen several cases of it. And then recently George Morris mentioned it in a Jumping Clinic article in Practical Horseman. That's why my friend is replacing her breastcollar. Better safe then sorry I guess.
It's very good to know, upnover, thank you!