Small Breed Waterproof Collar Sizing Guide
By Collared Creatures | Published: 2026-10-30
Category: Buying Guides
Learn how to measure your small dog's neck and choose a waterproof collar that fits securely and comfortably, with practical sizing rules and trade-offs.
Quick answer
Measure your small dog's neck snugly with a soft tape, add two finger widths of slack, and choose a waterproof collar whose adjustable range centers on that measurement.
Why sizing matters for small breeds
Small dogs have delicate necks and less fur padding, so a collar that is too tight can cause chafing or breathing discomfort, while one that is too loose can slip over their head. A proper fit keeps your dog safe on walks and prevents skin irritation.
Waterproof collars, such as those made from Biothane, do not stretch like nylon, so the fit you set is the fit you get. This makes accurate measuring even more important.
Understanding adjustable ranges
Most small breed collars are adjustable, but the range matters. A collar that adjusts from 21 cm to 28 cm suits dogs with neck measurements in that span, but you should aim for the middle of the range for the best comfort and adjustability.
If your dog's neck is near the maximum, the collar may sit too high or feel tight when buckled. If near the minimum, there may be extra strap that can catch on objects.
Sizing decision rules
- Measure correctly: Use a soft measuring tape around the middle of your dog's neck, where the collar naturally rests. Keep it snug but not tight—you should be able to slip one finger underneath. Re-measure every few months for growing puppies.
- Add slack: Add about two finger widths (roughly 2 cm) to the snug measurement to allow for comfort and movement. This is your target collar size. If your dog has thick fur, add a bit more slack.
- Choose the right range: Pick a collar whose adjustable range includes your target measurement, ideally near the middle. For example, a 21–28 cm collar suits a dog with a 23–26 cm neck. Avoid collars where your dog's size is at the extreme ends.
- Test the fit: After buckling, you should be able to slide two fingers between the collar and your dog's neck. The collar should not rotate freely or slip over the head. If the collar is too loose or too tight, adjust or choose a different size.
Product facts
- Fuchsia Small Breed Waterproof Biothane Dog Collar 21cm to 28cm Neck: This Biothane collar fits necks from 21 cm to 28 cm and has brass hardware with a sturdy buckle. The adjustable range covers many small breeds, and the brass buckle provides a secure, long-lasting closure that is easy to fasten.
Fuchsia Small Breed Waterproof Biothane Dog Collar 21cm to 28cm Neck
Fit guidance
Best for
- Small breed dogs with neck measurements between 21 and 28 cm
- Owners who want a waterproof, low-maintenance collar for daily walks
Not for
- Dogs with necks larger than 28 cm or smaller than 21 cm
- Owners who prefer a collar with a quick-release buckle or reflective features
