I could be wrong here, but this is what I'm getting:
How experienced are you? Because it seems to me like he's losing respect for you. Three weeks is more than enough time for a horse to have "tested" you-he is now beginning to form a clear picture of who's the boss. He was good the first week because he didn't know what kind of a handler you were, and he was just doing what he's been trained to do. If you've missed his subtle 'tests' along the way, he's figuring out that he's got your number, and he doesn't really have to be on his best behaviour. If he doesn't have much respect for you, he'll keep acting like this, and he'll get worse over time if you don't get a handle on it.
Last edited by pintophile; 12-15-2011 at 06:53 PM.