Ian Dunbar goes into using food treats and why they are NOT to be given all the time and slowly given less and less . You can read more in the training guide section of www.dogstardaily.com and also download his free e-book copy of his well known training book, After You Get Your Puppy, which also goes into all of this in detail. Lots of good advice above too! As Kate says, you are doing a quid pro quo that motivates your dog -- much faster learning than just with praise. Never punishment or leash jerks, of course!