How to correct a reactive puppy??

Submitted by Anonymous on Tue, 05/22/2012 - 22:00
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Hello, we just rescued a 4 month old Pit Bull Mix. He is a wonderful and smart puppy but when we are outside if he sees another dog his ears go up and his tail goes up and he stands erect and will start growling and sometimes lunges in their direction...how do I correct this now while he is young before it gets worse?