I have a 16.3 appendix QH that seems to have developed a limp when I ride him. His head bobs up and down unevenly while he walks. It is less noticeable at the trot and unnoticable at the lope. I am pretty big... 6'0", 235 lbs... but at 16.3 I should think my size would not be a factor. Without a rider he does not appear to limp at all. I have reduced his riding time in the hopes that the limp wil go away, but it has been two weeks now and it is still there. I had a farrier look at him and he found no problems with his hooves. I am pretty inexperienced so I could use some advice.
Here is a picture: