Dog/puppies learn just like us humans in a lot of ways. Anything praised for consistently will be repeated and anything corrected for consistently will go away. Dogs are creatures of habit and while training your dog consistence is the key, just like us humans they learn from doing the same thing over and over for a 30 to 45 day period. Now saying that bad behavior forms the same way so once a bad habit is present for 30 to 45 days it is ingrained in the brain and will take 30 to 45 more days to fix. Also remember just like kids and a lot of adults, dogs will push their boundaries and slip back into bed behavior if you let yourself get complaisant.