Is he off?

Ahh, sometimes I have the blankest mind.

Stiff through the pelvis/hips is entirely possible. His race career was ended by a fractured pelvis so it is entirely possible that there is arthritis in there too. And being that the colder nights have just begun that could explain why I am seeing it all of a sudden.

Any other suggestions are welcome! Will still be keeping an eye on him to make sure it is nothing of a more serious nature.
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He looks off in the right hind end to me.. I would try 2tblspoons of apple cider vinegar mixed with his feed & call the vet

Well there is a book called natural horse care by pat colby that helps you direct to minerals and supplements we really like doing things naturally
If his front is lame his head will bob if his rear is lame his hips will ditch in
Hope he gets better and he can still love you coz he doesnt look too bad
My horse had laminitis and now she can do little jumps and gallop but somtimes she still has bad days :)