I'm not sure what is going on with Diesel tonight! He is being so naughty, and mean!!! He gets so wound up and starts biting! This is the first time he's acted like this. Usually, if he bites I can say ouch loud and he stops. Tonight he acts like he doesn't even hear me! He gets out of his pen for about 15 minutes and starts acting badly so I put him right back in! What is his deal?? I'm hoping he's just having a bad night and its not the way he's going to start acting.... He's usually so sweet