Mr. Boma has a really cute wiener dog tutorial on YouTube, http://www.youtube.com/watch?v=LYdX7Wo8fkg. He is a very good instructor, clear and easy to follow and he goes at a very considerate pace.
I just recently got my first 321’s and so gave it a go.
I found the 321’s to be a bit tricky at first but after a few tries got the handle of it just fine. I found this design to be replication friendly. The trickiest part was getting the head right and inflating it the way he suggests, but it wasn’t anything major and after a few tries you get the hang of it.
My daughter was very excited about it as she has been asking for a puppy a lot recently,lol.
Below are pics of my replication.