Pit Bull

Question
Do dogs learn from one another, i.e., mimic behavior?

I ask because on the route that I walk with my dog, there is a new pit bull puppy (cute as a button) behind a four foot chain link fence with another mature dog (not a pit.) The puppy is very sweet and friendly but the other dog is territorial - barking, charging and growling behind the fence as we walk by, which, of course, is pretty common dog behavior.

 My question is, will this little pit pup learn to bark, charge and growl by observing the other dog and when it matures (considering the breed is genetically prone to dog aggression in the same way that a border collie is genetically prone to herding) become a danger?

 I guess the real bottom line question is, should I change my dog walking route when the pit bull grows up just to be on the safe side?  Thank you.  

Answer
It appears from your brief comment that this puppy is at extreme risk for all sorts of problem behaviors if he is allowed to be outdoors behind a less than secure perimeter fence in the company of another dog that already has fear aggression ("barking, charging and growling behind the fence as we walk by...")  People acquire dogs for all sorts of reasons but, honestly, I think there should be some sort of licensing required to own any animal.  Stupid people create serious problem behaviors in their dogs and then the dogs suffer (and often die) as a result.  I would avoid that area only because your own dog may develop anxiety because of the behavior of the adult dog.  Unfortunately, there's nothing you can do to help the puppy.