Strange behavior by one of my wethers this morning

[CMGifford]

first thing I thought of was back pain. Young goats play rough and it's possible that he was hurt in a "man game".

Have you checked if he has a pain reaction when you palpate his back? How far back does he reach? Rib area, loin region?

How long ago was he castrated? What method was used? 
Yes I ran my hands over him and rubbed all over his back, necks, and side and didn't get any pain response. Just a wagging tail. Lol He has been fine all day and night tonight. Says good and just seemed to really enjoy her to g extra scratches from me. 
He was banded at about 6 weeks old so 7 1/2 months ago. Like I said he's fine now so I'll just keep watching him I guess.