Can I use a Micro prong on a French Bulldog puppy?

Technically you could use it but due to the very strong and muscular build of a French Bulldog I would not recommend it. The micro prong would likely bend if he or she put their weight into the collar.

The "thickness" or gauge of the prongs isn't meant to withstand pressure from powerful dogs and Frenchies are very strong for their size. I'd suggest a regular prong collar (small size) with links added or removed as necessary.