Safe & Responsible Training
Recommended for use under the guidance of a qualified trainer. Please browse our list of recommended dog trainers.
2.25mm Prong – Twin O-Ring (Black)
A great piece of equipment to begin teaching your dog the foundation of following leash pressure, the Herm Sprenger 2.25mm Ultra-Plus prong collar is a tool that provides clear communication between dog and handler. The collar itself has blunt, rounded prongs that spread pressure evenly around the neck, instead of one pressure point on the trachea like a flat collar. We only supply genuine Herm Sprenger prong collars — German-engineered and the standard trusted by working and sport handlers worldwide — with the Ultra-Plus centre-plate for a smooth, secure fit. Fitted correctly and used with guidance, it can make your walks enjoyable again.
Best for most medium dogs — the everyday all-rounder — think spaniels, collies, Staffies and similar. The 2.25mm is the go-to first prong for the average pet dog, in a black stainless steel finish — the same rust-resistant steel with a discreet matte-black coating. Choose your gauge by your dog's strength, not neck size — length is set by adding or removing links.
Twin O-Ring or Swivel D-Ring — which should I choose?
Both attach your lead to the same collar; the difference is how the pressure feels and how the lead sits.
- Twin O-Ring — two rings give you a choice. Clip to both rings for a softer, limited-cinch action (the "dead ring" setup most handlers use day to day); clip to the single live ring for a fuller, more direct tightening action when you want clearer feedback. The versatile, adjustable option.
- Swivel D-Ring — a single ring on a swivel that turns freely so your lead never twists or tangles. A clean, direct connection, ideal for dogs that move around a lot, switch sides, or work on a long line.
This collar is the Twin O-Ring version.
CORRECT USE & FITTING
A prong collar only works when it's fitted correctly — worn wrongly it's both useless and unkind.
- In most cases the collar should sit high on the neck, right behind the ears and up under the jawline.
- Fit it snug by adding or removing links so it sits high and level — never buy a bigger collar and leave it loose.
- Match the gauge to your dog's size, not to the collar's length.
- Always run a backup: a safety clip or coupling strap to a flat collar, so your dog is never held by the prong alone.
- Generally we would not recommend prong collars for dogs under 7–9 months.
- New to prong collars? Work with a qualified balanced trainer. A prong supports training — it isn't a shortcut.
As with any training tool, you must condition the dog to the tool to ensure the best results. Applying a prong collar will not magically fix your dog's pulling issues, but when introduced and conditioned properly, it can improve and build strong communication between you and your dog.
We do not condone the improper use of our training prong collars. We strongly recommend seeking professional advice before utilising any training tool. To browse our list of dog trainers and behaviourists, please click here.
Dispatch times
Order before 12pm, Monday to Friday, and we’ll dispatch the same day. Orders placed after 12pm are dispatched the next working day. We dispatch Monday to Friday only. Orders placed at the weekend or on a bank holiday are dispatched the next working day.
UK delivery options
- Royal Mail Tracked 24: £5.99, delivered in 1 to 2 working days
- Royal Mail Tracked 48: £3.99, delivered in 3 to 4 working days
Delivery times are estimates from dispatch and aren’t guaranteed. Some products, such as dog food, are sent by Tracked 24 only.
Tracking your order
Once your order has shipped, you’ll get an email with your tracking number.
Delayed or Lost Packages
If your order is delayed or goes missing, please contact us at support@k9-corner.co.uk with your order number and details. We will work with the shipping carrier to resolve any issues as quickly as possible.
Incorrect Shipping Information
Please ensure all shipping details are correct before completing your purchase. K9 Corner cannot be held responsible for packages sent to incorrect addresses due to errors made at checkout.
Questions?
Email support@k9-corner.co.uk.
How to return an item: follow our step-by-step returns guide.
Our returns policy
- You have 14 days from delivery to tell us you’d like to return an item.
- Items must be unused, in their original condition and packaging, with all labels and tags still attached.
- Please email support@k9-corner.co.uk before sending anything back. Items sent without contacting us first may not be accepted.
- You’re responsible for the cost of return postage. Please use a tracked service, as we can’t accept responsibility for returns lost in transit.
- Returns should be sent to: K9 Corner Returns, Triple Oak, Brickyard Lane, Lewes, BN8 4AD.
- We’ll refund you to your original payment method within 14 days of receiving your return.
Faulty, damaged or wrong items
Contact us with your order number and a photo, and we’ll arrange a free return. This doesn’t affect your statutory rights under the Consumer Rights Act 2015.
Items we can’t accept back
Gift cards, opened food and treats, and personalised or custom items.
Remote training collars
All returned collars are inspected and tested. If a collar has been opened, paired, activated, worn or used beyond what’s needed to inspect it, up to 10% may be deducted from your refund to cover inspection and loss of value.
Questions? Email support@k9-corner.co.uk
International Orders — Please Read Before You Order
Your order is shipped from the UK. Because it's an export, no UK VAT is charged — the price you pay us does not include any UK tax.
When your parcel arrives in your country, it will pass through your local customs. At that point, your country's customs authority may charge import duties, taxes or VAT before the goods can be released to you. These charges are set by your own government under your country's rules — they are not set by us, are not collected by us, and are separate from what you pay at checkout. Whether anything is charged, and how much, depends entirely on your country's import thresholds and rates.
You, as the receiver, are responsible for paying any customs charges to release your parcel. You may also be asked by your customs authority to provide information or documents (such as a tax/VAT/EORI number) to clear the shipment.
Please expect possible delays. Parcels are sometimes held at customs for inspection or processing. This is a normal part of international shipping and is outside our control — we cannot speed up or predict how long your customs will take.
Every order is fully tracked. You'll receive a tracking number so you can follow your parcel at every stage, including while it's with customs.
By placing an international order, you understand that any customs duties, taxes or carrier handling fees are your responsibility and are determined by your country's authorities, not by us.
How it compares
View full range → 1.5mm Micro
|  2.25mm
|  3.0mm Short-Link
| 3.2mm
| |
|---|---|---|---|---|
| Breed Size | Small | Medium | Medium-Large | Large |
| Neck Size Range | Up to 25cm | Up to 33cm | Up to 43cm | Up to 48cm |
| Dog Weight | Under 7kg | Up to 18kg | Up to 40kg | Up to 40kg |
| ClicLock Compatible | No | Yes | Yes | Yes |
| Links per Collar | 10 (5 per side) | 10 (5 per side) | 14 (7 per side) | 10 (5 per side) |
