Hi there,
My 10 yr old Morgan X swishes his tail constently (even when hes standing by himself in the field) I live in Michigan so the climate is always changing (I noticed it in the summer and thought it might be from flies/the heat) but he is still doing it now that it is 30 degrees out! He appears semi irritaded when he does it, I have heard that this can mean that the horse is uncomfortable.. possibly from a bad back?

any advice!?!?

thanks
Karen