Aggression towards new puppy

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Barked: Thu Jan 10, '13 7:49am PST 
Bailey, our two year old, wonderful, ACD, is showing soooo much aggression towards our new 7 month old ACD, especially when I'm outside with them.We've had the young one for half a year now. Aggression is not getting better. Not sure if we can keep the young one, Cheeno, even though she is wonderful.Alpha dog, yes, but enough already.Help!! Can this get better?? What do I need to do?wave