Join Date: Jan 2009
Location: Southeast PA, USA
for the filly i'd have to say this is likely a pain issue. It could be she's out of shape and gets tired after a while, or has hoof or back pain, or is stiff. Or it could be something else all together, but i'd definitely try to get her checked out by a vet and then, if the vet doesn't find anything, maybe a chiropractor. If she's perfectly fine and you know she's not out of shape then im stumped. It really doesn't sound like a respect issue.
"The art of riding is keeping a *horse* between you and the ground."