Teaching your dog to sit is one of the easiest tricks you can teach.
Sitting before being given a treat or getting their leash put on is
sort of the canine equivalent of saying "please"- and for goodness
sake, you should teach your dog to say please!
To teach your dog to sit, just get out a
treat (a piece of dogfood will work), Say "Sit", hold it up and move it
back over his head. Most dogs will sit just so they can keep an eye on
the food. When the dog sits, give him the treat and say "good sit".
For dogs who don't sit automatically when
you hold the treat over their head, you can physically help them by
holding the collar and pushing down on the hindquarters. Remember to
treat and praise as soon as possible after the dogs hindquarters touch
the ground.