Hi Jodi,
if he is fit and well otherwise, I woud call a chiropractor to have a look at him. Altough he might not appear to be in pain, he can't be very comfortable, if his pelvis is out.
I can recommend a very good one. Her name is Sarah Howells and she is in Usk. Does humans and horses and was one of the support team for the Barclona Olympic's.
Hope this helps.

Thankyou I am going to call a chiropractor out,I had Andrea Pole last time and she was very good,will phone her and make an appointment,vet is coming to do vaccs anyway so will also get him to have a look/do referal.thankyou