How to cut a light-up dog collar without damaging it?
Many light-up dog collars are designed to be adjusted to fit your dog's specific needs. For a safe and lasting result, it's best to follow a precise method. In this article, discover how to cut a light-up dog collar cleanly, without damaging the light or the USB charging port, and ensure optimal visibility during nighttime walks.
Why cut a dog's light-up collar?
A collar that's too long can slip, bother the dog, or reduce the visibility of the LEDs. Cutting the collar to the correct size improves comfort , safety , and appearance. A precise fit distributes pressure evenly and prevents pressure points around the neck. It's a simple step to ensure your dog's light-up collar fits perfectly.
- Custom-made to fit your dog's neck size .
- Regular visibility all around the collar.
- Less swaying, therefore less discomfort when moving.
Is your dog's light-up collar "guilty"?
Before making any adjustments, check if your LED dog collar is designed to be shortened. Most adjustable models use a fiber optic tube connected to a light module. Others, with LEDs integrated directly into the strap, should not be cut.
- Manufacturer's note: look for the words "guilty" or "adjustable by cutting".
- Construction type: flexible tube + USB module on one side, cap on the other.
- Cutting point: usually on the end opposite the USB port.
If in doubt, turn on the dog's light-up collar and observe the light path. Note where the light enters the tube: this is the side that should not be cut .
Recommended equipment
- Sharp scissors or a precision cutter .
- Thin adhesive tape (to mark the cutting point).
- Use a clean, dry cloth to wipe the tube after cutting.

Steps to cut a light-up dog collar cleanly
1. Measure the neck circumference
Place the light-up dog collar ( with the collar off) around your pet's neck in its usual position. Leave a two-finger gap between the collar and the neck to ensure a snug fit . Mark the target length with a small piece of tape.
2. Identify the correct side
On rechargeable models, the USB port and the light module are located on one side. Always cut on the opposite side , at the end with the removable cap. Never cut near the module or the connector.
3. Cut without crushing the tube
Remove the cap, hold the tube straight, and make a clean cut at the marked point. Avoid twisting the tube during this operation, as this could crack the fiber and impair light diffusion.
4. Replace the cap firmly
After cutting, reattach the cap to protect the end and limit the entry of water or dust. Press firmly until it feels secure. A properly attached cap helps maintain the waterproof seal of the light-up dog collar.
5. Test the light diffusion
Turn on the light-up dog collar and check that the light is continuous all the way around. If an area appears dimmer, slightly adjust the position of the tube in the cap to optimize the light distribution.
Practical tips for a lasting result
- Test it on the dog's neck before the final cut.
- If you are unsure about the length, proceed with small, successive cuts .
- Don't cut it too short: a shortened necklace cannot be lengthened.
- After cutting, wipe the tube to remove chips and dust.
- Regularly check the cap and the condition of the tube after rides in the rain.
USB charging: what you need to know
Most USB rechargeable light-up dog collars retain their performance after cutting, as the battery and module remain intact. Be sure to keep the USB port clean and dry. Charge the collar after the first few uses to check battery life and light stability.
- Recharging via standard USB (cable supplied depending on the model).
- Indicator light during charging and when fully charged.
- Avoid prolonged immersion: a “rainproof” necklace is not a diving device.
Common mistakes to avoid
- Cutting on the wrong side (USB side) will damage the connector.
- Crushing the tube by cutting creates cracks and dark areas.
- Removing too much length will make the collar too tight and uncomfortable.
- Forget the cap , leaving the end open to moisture.
Quick guide: how to check the correct size
Once the light-up dog collar is cut and reattached, place it around your dog's neck and check the two-finger rule. The collar should remain stable without being too tight. Gently shake it to ensure it doesn't rotate excessively. Turn it on in a dark place to confirm 360° visibility .
FAQ – Light-up dog collar
Can all light-up dog collars be cut off?
No. Only fiber optic tube models with a cap on the side opposite the USB port are designed to be cut. Necklaces with LEDs sewn into a strap should not be cut.
I've turned it off and the light is uneven, what should I do?
Check that the tube is properly aligned in the cap and that it is clean. A crooked cut or a cap that is not properly inserted can disrupt light diffusion.
Does the haircut affect battery life?
No. The battery is not affected by the cutout. Just make sure the USB port remains clean and the cap is securely closed.
How to care for a cut-off light-up dog collar
Clean it regularly with a damp cloth, check the cap, and avoid prolonged immersion. Recharge after heavy use to maintain performance.
Noble Truffle Council
Before cutting a light-up dog collar , measure carefully and proceed step by step. A precise fit improves your companion's safety, comfort, and visibility. Always test the light after cutting and regularly check the condition of the cap. Peaceful nighttime walks start with a properly adjusted collar.

