Some hores you'll be able to walk down, but some will just keep walking (or trotting or running). I have a mare that will happily keep meandering away. The last thing you want to do is start actually chasing the horse - trust me, I've done this out of frustration, and to a smart horse, it's just a fun game. Plus, you'll tucker out a lot sooner than the horse!
Is your pasture small enough to work the horse like it's in a round pen? That may be what your trainer meant. That's what I've had to do with my mare. She's in a large pasture, so I need to be close to something she wants (water trough, feed, etc...) so she won't just take off. Once the horse "joins up," you back up a little, draw it in, and catch it.
You shouldn't need to work the horse until it's physically tired, especiatlly if you've worked it in a round pen before.
It's also a good idea to not work the horse every time you catch it. I'm sure that was part of my problem.
Last edited by LisaG; 01-29-2013 at 11:00 PM.