Slipping over help!!

[bunny]

Help!! my friend rode my boy today in the school (not quite a menage but a barked area on a very slight slope) I was tacking up inside - heard her shout went out and he was lying down... Not sure if he slipped or just kind of collapsed, she wasnt sure. He had a look around himself and got up. I got on him and he seemed fine - walked trotted and had a quick canter. It isnt the best surface so I am always careful with him but I have noticed when riding him sometimes on any surface his back legs kind of slip under him. Never on the front always behind, not a lameness more like them giving way. He wees quite a bit, I think he has always done this. Just wondered if anyone has any ideas at all

[Milliesmum]

Have you had back and saddle checked recently?

[bunny]

Hi, Yes back done about 1-2 months ago and saddle fitted to him at the same time thanks for your reply

[Milliesmum]

Odd then, because my first thought was some kind of back thing, maybe a trapped nerve or something which is only affecting him with a riders weight on his back. Would be tempted to have the vet or a back specialist take another look?

[Milliesmum]

Another thought, is he shod on the back, does it make any difference whether he has shoes on or not?

[bunny]

Yes its like a trapped nerve kind of thing - a sudden jolt that makes him loose his footing... he isnt shod at all - he never has been and we have very smooth tarmac here his feet wear well. He is careful walking up a stone path but seems happy in his feet apart from that

[merlod]

Could be cold back. Put saddle on and tighten girth very slowly whilst walking around.(Takes two!)

[bunny]

Thanks merlod.... I thought the cold back would only affect him at the start - this can happen after an hour sometimes or am I wrong