Make sure to have your brain turned on and have enough information before you change the air in your mouth.
I guess this works both ways...If you are going to post videos of your dog working with the caption "FRIII Face attack with 5 crushed vertebrae" then you are going to open yourself up to question and/or ridicule. So, let me see if I have gleaned the right information from the limited amount you have provided... You state that the only symptom your dog displayed was for refusing to jump. You felt that it was a training issue, yet you sought the advise of 5 veterinarians...(I don't know about the other idiots but I, like the one from MISU start all my lameness/orthopaedic exams with evaluating the dog/horse's stance and gait walking and trotting). Low and behold another symptom of dragging/scuffing the back nails was observed. Now maybe I spent to many years on the farm, and maybe you didn't, cuz even before becoming a vet I knew if a horse or dog was dragging/scuffing ANY feet/toes in a consistent manner, there was a problem...we didn't throw that dog on stock and work the snot out of him, and we definitely didn't ride that horse! Ok, I'll give you the benefit of the doubt, and we'll say you either didn't know that piece of information or didn't notice...you still suspected a problem, the dog was refusing jumps, for some reason unknown to you, and you still took him to trial, with or without a veterinarians advise. ME, I'm just not that gutsy. I want all the pieces in place before I go to trial, which would include knowing the cause of/or fixing my jumping problem. Now to answer some of the questions you posed/didn't pose.
1) The problem with using a video of a dog working (unless the problem is severe or only present during the rigors of a trial) is that they are higher than a kite and pain tolerance goes way up, making the video completely useless as a diagnostic tool.
2) I don't know anything about the quality of your x-rays or the time in the disease process they were taken, however, most people don't realize that depending of the injury type any length of time from the first set of x-rays,retakes often show changes to bone, muscle, tendon etc. that can make the diagnosis much more apparent (i.e. remodeling, calcification, deposition etc).
3) If there continues to be a problem, and your regular vet is unable to make a diagnosis, ask for a referral to a specialist sooner than going to 5 vets and getting the same answer...
The real moral to this story is:
Don't post videos with a caption bragging about trialing a dog with 5 crushed vertebrae, because there are lots of us out there that just don't think that's cool, I just happen to be more vocal about it...
A Hopefully Better Educated Idiot,
Ps, I have enjoyed the training videos of your young dog