Calculadora de Tamanho de Peitoral/Coleira
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
XS<30 cm | S 30-45 | M 45-60 | L 60-75 | XL>75
About this calculator
This calculator helps determine the ideal size of a harness or collar for dogs and cats based on chest circumference. The measurement is taken just behind the front legs, at the widest part of the chest. The result classifies the animal into sizes from XS to XL, following a reference table: less than 30 cm is XS, 30-45 cm is S, 45-60 cm is M, 60-75 cm is L, and above 75 cm is XL.
To use, measure the chest circumference with a flexible tape measure, without tightening too much. Enter the value in centimeters in the indicated field and click calculate. The tool is useful for pet owners buying accessories online or in physical stores, ensuring comfort and safety. A too tight harness or collar can hurt, while a too loose one can slip off.
Important precautions: the measurement should be taken with the pet standing and relaxed. Fluffy animals may need an extra 2 to 3 cm allowance. Remember that each manufacturer may have variations in the size chart, so always check the product specifications. This calculator serves as a guide, not replacing the veterinarian's or manufacturer's recommendation.
Common use cases include: growing puppies (measure periodically), dogs with deep chests (like Bulldogs), and cats that wear harnesses for walks. The tool also helps avoid returns and exchanges in online purchases.
Frequently asked questions
Where exactly should I measure my pet's chest?
Measure just behind the front legs, at the widest part of the chest, with the pet standing.
My dog has very thick fur. Should I add extra allowance?
Yes, add 2 to 3 centimeters to the measurement to ensure the harness is not too tight.
Does the calculator work for cats too?
Yes, it is suitable for both dogs and cats, as long as the measurement is done correctly.
Is the indicated size the same for all brands?
No, each manufacturer may have different size charts. Use the result as a reference and check the specific brand.
My puppy is growing. How often should I measure?
Every 2 to 4 weeks, as puppies grow quickly and the size may change.