Leave it is so much fun to train and cavaliers get it quickly -- they are so wiling to wait for a good reward even if it means leaving something they already want! :lol:
Recall is probably the most important, and the hardest to do reliably -- in part because people do not make it a part of everyday activity and then will tend to scold or punish a dog for not returning, at the point when the dog finally returns or they go get the dog -- thus teaching the dog that returning or being close to the owner is totally confusing and risks punishment, especially if you return when called. :yikes
Trainer Ian Dunbar sees a relationship between loose lead walking and recall though that is worth thinking about. Here's his approach:
http://www.dogstardaily.com/training/pulling-leash
and see
http://www.dogstardaily.com/training/training-dog-walk
and he also goes further into natural, fun, positive training for this in his free download book on that site,
After Your Get Your Puppy which is really the one puppy ownership and training manual anyone will ever need! I always recommend anyone with a puppy or even older dog or rescue **download this book** as it will answer endless questions and also give excellent guidance on issues that also affect older dogs and untrained rescues.