I was out with my gelding today and noticed a slight clicking in his left front area, I couldn't pinpoint exactly from where, but I think it was in his shoulder. It didn't seem to bother him at all, and it happened every single time he lifted his front left foot. I've never heard this in him before and it didn't start until I started lunging him.... is this something to worry about? He is 5 years old. Should I get him on a joint supplement? If so, what kind?