Please measure using our guide to assure an accurate fit.  Contact us if you have sizing questions.  Measure at line 2 on our diagram.

12 Prong fits 10 1/2" to 19"  and is 1" wide.

Micro Prong collars were designed originally to fit small dogs, because the larger prongs on standard size collars were too far apart, causing both fit and effectiveness issues.   A Micro collar is made up of miniature prongs with a much shorter distance between them than typical prong collars.