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By puppy I mean from when teething is done to about 10 months which yeah does get into the area of "young dog" as well.  So now the targeting is perfect...  Now I look to the dog to tell me what kind of entry building it needs.  Usually on leash drag into the bite builds drive to pull and give it their all and have a nice snappy grip once  they get there.  I quickly move them on from there to drag-to-free bites.  That last few feet has the handler let go of the leash to give the pup an exhilerating moment of finally! freedom.  The distance of the free part is gradually worked to be longer depending on the dog's reaction.  If you see hesitation instead of elation, then take it back to rotating between full drag ins - no free, and drag in with short end bursts of free in order to build up their confidence in their ability to do it on their own.  It's just a puppy, so unless it's more like 8 months than 5 months time is way on your side, no need to rush, let the pup progress at the pace they need.  Some young dogs do better with no restraint from the handler just free sends because they are very confident and want to run as fast as they can for the joy of getting there faster.  

So now the desire is strong, the grip is where you intended it to be, the grip is how it should be for their age, and the pup is building up its confidence for running in to get the bite on their own.  Next is some elementary upper body introduction for the primary leg dog so that later when it gets blocked by some giant accessory it won't bat an eye, but will plow over it to get a high bite.