Quick answer
Measure your dog's neck at its widest point, usually just behind the ears and above the shoulders, using a soft tape measure. The collar should fit snugly but allow you to slide two fingers underneath. Recheck the fit monthly, especially for puppies and dogs with thick winter coats.
Gather the right tools before you start
A flexible cloth tape measure works best because it contours to your dog's neck. If you don't have one, use a piece of string or a thin strip of fabric, then lay it flat against a ruler to get the measurement. Avoid using a metal tape measure; it won't curve comfortably and can startle your dog.
Have a few high-value treats on hand. Measuring goes faster when your dog is standing still and relaxed. If your dog is wiggly, ask a second person to help hold them gently.
Find the widest part of the neck
The widest point is typically right behind the ears and above the shoulder blades. For dogs with a thick ruff or loose skin, measure at the base of the neck where the collar naturally sits. If your dog has a very fluffy coat, part the fur so the tape rests against the skin, not on top of the hair.
A common mistake is measuring too low, near the shoulders. That spot is usually narrower, and a collar sized there may be too tight when it sits higher up.
Wrap the tape and record the number
Wrap the tape around the neck so it lies flat and parallel to the ground. It should touch the skin but not indent it. Write down the measurement in inches or centimeters, and repeat the process once more to confirm. If the two numbers differ, take the larger one.
For puppies, add a little extra room for growth, but not so much that the collar slips over the head. A collar that's too loose can be a safety hazard.
Use the size chart to pick a collar
Every brand sizes differently, so always check the specific collar's size chart. For example, the Daybreak Ultralight Collar comes in sizes based on neck circumference, and the Tie Dye Waterproof Leash + Collar Bundle includes a collar with its own size range. Match your measurement to the chart, and if you're between sizes, choose the larger size for adjustability.
Tie Dye Waterproof Leash
Remember that collar width also affects fit. A 1-inch wide collar distributes pressure better for strong pullers, while a narrower collar may be more comfortable for tiny breeds.
Test the fit after putting it on
Once the collar is on, slide two fingers between the collar and your dog's neck. If you can't fit two fingers, it's too tight. If you can fit more than two, it's too loose. The collar should sit high on the neck, just behind the ears, and not slide down to the shoulders when your dog walks.
Watch your dog for signs of discomfort: scratching at the collar, excessive panting, or reluctance to move. A properly fitted collar shouldn't cause any of these.
Know when to resize
Recheck the fit every month, and always after a bath or swimming session, as some materials can stretch or shrink slightly. Puppies need weekly checks until they're full grown. Dogs that gain or lose weight, or grow a thick winter coat, may also need an adjustment.
If you notice the collar leaving a mark in the fur or your dog can back out of it, it's time to resize. A loose collar can slip off during a walk, while a tight one can cause skin irritation.
Step-by-step collar measuring guide
- Step 1: Gather supplies: Use a soft tape measure or a string and ruler. Have treats ready to keep your dog calm. Checkpoint: Ensure your dog is standing still before you begin.
- Step 2: Locate the widest part of the neck: Measure just behind the ears and above the shoulders, parting fur if needed. Common mistake: Measuring too low near the shoulders, which can result in a too-tight collar.
- Step 3: Wrap and record: Wrap the tape snugly, keeping it parallel to the ground. Record the measurement and repeat for accuracy. Checkpoint: If two measurements differ, use the larger one.
- Step 4: Match to the size chart: Compare your measurement to the specific collar's size chart. If between sizes, size up. Common mistake: Assuming all brands use the same sizing.
- Step 5: Test the fit: Put the collar on and check that you can fit two fingers between the collar and neck. Checkpoint: The collar should sit high on the neck and not slide down.
- Step 6: Recheck regularly: Measure again monthly, after grooming, or if your dog's weight changes. Next step: Adjust the collar as needed to maintain a safe, comfortable fit.
Product facts
- Daybreak Ultralight Collar: Daybreak Ultralight Collar: Width: 1 in; Made from tightly woven, light-weight polyester webbing; Heavy-duty plastic buckle; Iron d-ring. The 1-inch width provides strength without bulk, and the iron d-ring offers a secure attachment point for leashes. The lightweight webbing is comfortable for daily wear.
- Tie Dye Waterproof Leash + Collar Bundle: Tie Dye Waterproof Leash + Collar Bundle: Includes waterproof collar and leash made of PVC coated polyester webbing; Leash length 6 ft, width 1 in, weight 5.6 oz; Swiveling e-coated iron bolt snap; Rated for 2 kN; Suitable for all dogs; Collar available in sizes. The waterproof material repels water and dirt, making it ideal for active dogs. The bundle ensures a matching fit, and the collar's size options help you get the right fit based on your measurement.
