Herm Sprenger Dog Training Prong Collar, 20-Inch Purple, 3 mm Short Links

Herm Sprenger’s 3.0 mm prong collar is an adjustable dog-training collar with short links, a Click Lock buckle and a 20-inch overall length for dogs with necks up to 16–17 inches.

• 20-inch overall length; fits necks up to 16–17 inches — adjust the fit by adding or removing links.
• 3 mm wire gauge and seven short links on each side — fine-tune the collar length.
• Click Lock buckle, swivel D-ring and U.S.-made Biothane insert — support fastening and leash attachment.
• Made in Germany and assembled and enhanced with Biothane in the U.S.A. — a collar with production steps in both countries.
• The assembly chain tightens when the dog pulls — designed to aid behavior correction during training.

This collar is made for dog training and for handlers who want an adjustable fit with a quick-release fastening system. Its short-link layout provides more control over length adjustment, while the swivel ring accommodates leash rotation during walks.

What size dog does this collar fit?

The 20-inch (50.8 cm) collar is designed for dogs with neck measurements up to 16–17 inches (40.6–43.2 cm). Measure your dog’s neck and compare it with that range; the collar can be adjusted by removing or adding links. For training, it should sit snugly under the ears and along the jawline.

• Wire gauge: 3 mm.
• Short links: seven on each side.

How do the buckle and leash connection work?

The Click Lock buckle allows the collar to be put on and removed, and the swivel D-ring rotates 360 degrees for leash movement. A U.S.-made Biothane insert adds stability to the connection between the buckle and the prongs.

The black plastic jacket slides on and off the unfastened buckle. It does not prevent the buckle enclosure from functioning.

• Fastening system: Click Lock buckle.
• Leash attachment: swivel D-ring with 360-degree rotation.

How is this collar used for training?

The assembly chain tightens when a dog pulls, a mechanism intended to aid behavior correction. The seven shorter links on each side let you regulate collar length more precisely than a layout with longer links.

Position the collar snugly under the ears and jawline for training. The collar combines black stainless steel prongs with a purple finish and Biothane insert; it is made in Germany and assembled and enhanced with Biothane in the U.S.A.

• Adjustment: add or remove links to change the length.
• Fit guidance: place it snugly beneath the ears and jawline.

This Herm Sprenger collar suits handlers looking for an adjustable prong training collar with short links, a quick-release buckle and a rotating leash ring, sized for necks up to 16–17 inches. Its 20-inch length, link adjustment and specified snug-fit placement define how it fits and is used.