You do not need to phase out treats. My dog is now 18 months old and he still gets treated for every recall. It reinforces your command and makes them want to come back each and every time.

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I OWN A CHOCOLATE ROAN COCKER SPANIEL
RIP David xx Run free at the bridge. Love you always xx 19th February 2011
RIP Jack and Mickey xx Run free at the bridge. Love you forever xx 20th June 2011