My guy is a senior TB at 20. I've had him for 5 months and during this time have seen his blanket get dirty on one side only, the left.
In the past month I've been doing april battles' yoga for horses and have seen some small improvements in his flexibility in lateral flexion. I was surprised today to see his blanket covered in mud on the other side, the right side.
My newbie question is: do most horses roll on both sides, is it a comfort issue or flexibility issue? I've seen the 32 yo qh mare I ride roll only on one side in the 3 years I've spent time with her.
I would think younger horses have no problem on either side, but older horses may have a side that is more comfortable for them. At any rate, I am pleased.