Prongs will work as well but I would use it as a last resort. I have used them so I am not against them but I would really try the lupi first. If you do go with a prong make sure you get instruction on how to use it properly because used improperly they can do more harm than good.
A dog has so many friends because they wag their tails not their tongues.
R.I.P. Buddy 2002-2008 The best Mastiff ever.
Now owned by Clark the Crazy American Bulldog