I seriously doubt that you have a "mean" dog on your hands. I think you're saying that it's only happened twice so far, right? If you could give us a little more information, it would help...
Why are you chasing him in the first place? Does he have something that you're trying to take away? Are you trying to put him in his crate or someplace similiar? Given the particulars, we could probably help you more.
In the meantime, I second the suggestion to enroll in a puppy obedience class. It's well worth the time and money, and besides, it's fun!
I would discontinue your use of the "alpha roll". It makes many dogs more aggressive, not less.
__________________  FirstYorkie
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