
Getting the right fit for your pet’s bed or harness is essential for their comfort, safety, and health. An ill-fitting harness can cause chafing or even injury, while a poorly sized bed can lead to discomfort and poor sleep. Follow this simple guide for accurate measurements.
Tools You’ll Need:
- A flexible measuring tape (or a string and a ruler)
- Your pet standing in a natural position
- Treats to keep them calm and cooperative
Part 1: Measuring for a Harness
Step 1: Measure the Neck
Wrap the measuring tape around the widest part of your pet’s neck, where the collar normally sits. Make sure you can fit two fingers comfortably between the tape and your pet’s neck to ensure a safe and comfortable fit.

Step 2: Measure the Chest/Girth
This is the most important measurement for harnesses. Measure around the deepest part of your pet’s chest, just behind the front legs. This is typically the widest part of their ribcage.
Step 3: Measure the Back Length (Optional for some harnesses)
Measure from the base of the neck (where the collar sits) to the base of the tail. This helps with harnesses that have back attachments or need specific length coverage.
Tip: Different harness brands have varying sizing charts. Always refer to the specific brand’s size guide before purchasing.

Part 2: Measuring for a Bed
Step 1: Measure Your Pet’s Length
Have your pet lie down in their natural sleeping position. Measure from the tip of their nose to the base of their tail (not the tip of the tail). Add 6-12 inches (15-30 cm) to this measurement to ensure they have room to stretch out comfortably.
Step 2: Measure Your Pet’s Width/Curled Position
Measure the width of your pet when they are curled up in a ball. This helps determine the minimum diameter needed for a round or oval bed.
Step 3: Consider Their Sleeping Style
Does your pet sprawl out or curl up? Sprawlers need more surface area, while curlers may prefer a bed with raised edges for security.

Tip: For senior pets or those with arthritis, consider orthopedic beds that provide extra support. Measure the bed’s thickness as well to ensure easy access.
General Tips for Success
- Measure your pet when they are calm and standing or lying naturally
- Take multiple measurements to ensure accuracy
- If your pet is between sizes, choose the larger size for beds and refer to the harness brand’s specific guidelines
- Consider your pet’s weight along with measurements, as some products are weight-rated
- Re-measure your pet every 6-12 months, as their size can change
With these accurate measurements, you’ll be able to select a bed or harness that provides optimal comfort and security for your furry friend!