This is one of my boarding horses. His owner has only been out a handful of times in the past year and a half. I know that she is hoping to get out this summer and use him.
He has been here for over two years and he has always been stiff/sore. He regularly gets hoof abscess that I treat. He MAY be working up another one attributing to his "off gait" in the video, but he may be just that sore on whatever it is that bothers him. That aside, he just gets steadily more stiff.
His back end (hip, I believe) clicks whenever he walks. His back is sore when you run your hands down it. He literally cannot flex his neck or get his head to his side for an itch. He now has a head "bob" when standing still indicating that something hurts. He loosens up once moving, if the horses are playing, but when he walks off from a stand it looks very sad.
This horse is eight years old. And honestly, not as much of a tub as the video makes him look. He's a fuzz over weight, but for some reason he looks obese in the one video.
I have informed his owner each and every time that the chiropractor, vet or dentist has been out and insisted that he should be seen by each one of these. I have done everything and more, short of paying his vet bills and dentist bills, to keep him comfortable while he toddles around out in the pasture here but he should really be seen.
Knee jerk reaction, what do you feel is bothering this horse?