Sizing Guide

Size Guide Notice

At MMNB®, we know the right fit makes all the difference. Our updated universal size chart applies to all new collections launched in 2026 onward.

What’s new?

Our designs have been upgraded for a roomier fit and more comfortable movement. As a result, sizing has been adjusted:

  • Previous 2XL is now 3XL (sizes are not the same)
  • A new 2XL has been added to better bridge the gap between previous XL and XXL

For returning customers:

  • If you previously wore 2XL and it felt too big, the new 2XL may be the right choice.
  • If you previously wore 2XL and it felt too small, we recommend 3XL.

Because fit may vary by design and fabric, please always check the Size Guide on each product page before purchasing.

Need help choosing a size? Reach out via Live Chat or email — we’re always happy to help.

Prioritize Girth over Back Length—our optimized length ensures great coverage.

1. Measure Girth FIRST

  • The Chest/Girth is the main factor. If the chest is too tight, the garment will be uncomfortable and restrict movement.
  • Measure around the widest part of the rib cage, just behind the front legs.

2. Size Up for Comfort

  • Your dog's measurement should fall near the middle or lower end of the size chart's range.
  • Always size up to the next size for a comfortable, mobile fit if the measurement is close to the maximum limit.

Our design ability to stretch based on the fabric, make sure to read designated size guide on product descriptions.

Every pup has unique proportions, so we recommend checking our standard size chart for the best fit. Not sure? Reach out to us at support@shopmomonobu.com for personalized assistance!