I advocate getting your pup first and getting a good relationship going, good obedience training done and making sure he is tuned into your needs. THEN get chickens. Dogs do not view chickens as an animal that owns a territory and thus is careful of misbehaving there. That yard will be YOUR territory in which you allow the pup to be, then the chickens, etc. In this order of things, the pup will view you as pack leader and himself and chickens under your dominion. YOUR chickens, not HIS, nor his rivals or even prey.