One of the hardest things to learn when training horses is when to quit. Has anyone ever try to teach you something when you are mad, irritated or grumpy? It doesn’t work out so well, does it? It’s the same way with horses. They’ll never learn anything when they’re confused or irritated. I’m not saying you should let them get away with anything, but when they’ve listened good for an hour or two, and are just starting to get grumpy, it might be time to stop for the day and give your horse’s brain a break.