About the Herm Sprenger 3.2mm Ultra-Plus
Herm Sprenger has manufactured prong collars in Germany for over 100 years and is widely regarded as the standard among professional balanced trainers. The 3.2mm Ultra-Plus is the brand's heavy-duty gauge in the everyday prong range — built for medium-to-large working dogs where the 3.0mm Short Link's compact frame doesn't give enough neck reach.
Where the Short Link uses shorter assembly-chain links to pack more contact points around a smaller circumference, the 3.2mm uses standard-length links and a broader frame — fewer contact points, but more reach and more material per link. It's the traditional choice for serious training across larger working and sport dogs.
Made from high-grade stainless steel with rounded prong tips and precision-cast components, the 3.2mm weighs around 115g and fits necks up to 48cm in the base size — extendable with additional middle links for larger neck circumferences.
Which breeds and sizes suit the 3.2mm
The 3.2mm is designed for dogs between 25 and 40kg with necks up to 48cm in the base size. Typical breeds include:
- Working and protection lines: full-size German Shepherds, larger Belgian Malinois, Dutch Shepherds, Belgian Tervurens
- Retrievers and gun dogs: Labrador Retrievers, Golden Retrievers, Chesapeake Bay Retrievers, larger Pointers and Setters
- Bull and bully breeds: Boxer, American Bulldog (smaller frame), Bull Terrier (large frame), Staffordshire Bull Terrier (full size)
- Working/utility: Doberman, Rottweiler (smaller frame), Standard Poodle, Standard Schnauzer (large frame), Anatolian Shepherd (smaller frame), Bernese Mountain Dog (smaller frame)
- Other: larger Vizslas, Weimaraners, Wirehaired Pointing Griffons, larger Border Collies and Australian Shepherds
Fitting and introducing the collar
Three principles, drawn from the Herm Sprenger usage guide and the consensus of balanced trainers:
- Position high on the neck — behind the ears, just below the jawline. Never low against the shoulder or trachea.
- Two-finger fit — snug enough that the collar stays in place when relaxed, loose enough that two fingers slide flat between the collar and the neck.
- Resize with links, not slack — add or remove individual links so the chain has no looseness when the leash is unweighted. Spare middle links ship with the collar; replacement links are available individually.
A backup safety connection — a flat collar and back-clip harness, or a slip lead loop — is standard practice. With larger working dogs the safety is non-negotiable: a prong link can work loose under repeated correction, and the backup prevents an off-lead moment with a strong dog.
Introduce the collar in a low-stimulus environment first, across two or three short, neutral wear sessions before any leash work, so the collar's presence is uneventful before it's actively used.
When not to use the 3.2mm
The 3.2mm is a training tool, not a permanent walking collar. It should not be used:
- On dogs under approximately 7-9 months of age (breed-dependent)
- For off-leash work, in crates, or during travel
- On dogs with neck, throat, or thyroid conditions without veterinary clearance
- Outside the intended weight class — 25 to 40kg. Smaller dogs should use a lighter gauge; heavier dogs the 4.0mm.
If you're new to prong collars on a larger dog, work with an experienced balanced trainer for the first few sessions before progressing to solo handling. Larger dogs require more handler skill, not less — small handler errors translate to bigger consequences.
