With the buckle collar and 6 foot leash attached, have the pup sitting at the heel position. Take hold of the leash so that when the leash is tightened, the hand will be just in front of the pups' nose without touching the pup. Hold the leash between the thumb and the first finger of the right hand as tightly as you can. Give the command to 'STAND' and pull forward to make the pup get up from the sit and stand up. When the pup is standing, stop pulling! Release collar pressure and praise the pup. Rub it under the belly and along the side, encouraging it to remain standing. Give a release word and begin again.
Remember that all along, the pup has been sitting whenever you stop moving. This will be confusing to it and will take time to teach. Be sure to give a strong command so that it hears 'STAND' and not 'SIT'. Do not continue pulling on the leash as this will teach the pup to walk on you rather than stop once it is standing. Correcting for the walk is very difficult. Get the pup standing and hold it still.
Once the stand has been understood so that the pup begins moving forward when the command is given, begin to leave the pup at the stand as you did at the sit/stay. Stand directly in front of the pup for a short period of time. Build up the time before building up the distance. Eventually you want to be able to stand 6 feet away from the pup.
Now recruit some help or at least do it yourself, but you must have the pup examined briefly. If you are 6 feet away and someone approaches the pup and it moves, you must correct it. Then backup in the training process so that when it is examined, you are right there in front of it. As the pup begins to remain in place, you can begin to increase the distance again. It will not take as long as before.
Have each exam a pleasant experience. Otherwise the pup will be afraid. But do not give food or the pup will leave position or investigate all examiners for food. Just praise and pets are quite sufficient.
If you can hold your right hand in a vertical position when pulling forward (maybe later in the training), you will be accustoming the pup to the hand signal as well. That is the open palm of the right hand in front of the nose and pulled forward about a foot or so before returning the hand to normal position.