Teaching your dog how to stand on all fours when commanded isn't only a great trick, you can use it for emergency stays, to teach him Red Light/Green Light (another great safety skill), and it's simply a great way of pushing him further in his training process.
To start, I recommend grabbing some of your dog's favorite training treats and your training clicker. You'll have your dog either sitting or laying down to start. Then, you'll want to put your hand in a fist with the treat in it. With your fingers facing your dog's nose, you will then lift your hand slightly up and towards yourself. Be sure to not move too fast with this.
The goal is for your dog to stand in the same exact spot that he was sitting or laying down in. You'll then want to make sure that your dog stands there for a moment or two - and release once he's successfully held the position!
Once your dog is doing this reliably, you'll then start adding in your verbal command, "STAND" or "STAND STAY". Add distance with your hand signal as well and see if your dog can perform the command with a little more distance.
With any specific training questions, don't be shy! Message Busy Dog today so we can help with all of your training needs.