We do not recommend using this without trainer's supervision.  If you are thinking about purchasing one, please also consider one of our training programs.

Herm Sprenger Ultra-Plus Prong Dog Training Collar Steel Chrome Plated Dog Prong Collar

• 2.25mm - 12"
• 3.0mm - 16"
• 3.2mm - 18"
• 4.0mm - 20"