Size Guide

Learn how to measure your pup and choose the best fit.

Between Sizes?

If your pup falls between sizes, choose the size that comfortably accommodates both the chest and neckline.

Different styles may fit differently, so we recommend using Find My Fit on each product page for the most personalized recommendation.

For longer-backed pups, choose the size based on chest and neck first. Back length may affect coverage, but it does not always mean you should size up.

Style Fit Notes

Each dear thomas style is designed a little differently, so the same pup may wear different sizes across different styles.

Some styles are more fitted through the body or neckline, while others offer more room through the chest or a longer back length.

• Cherry Kiss has a shorter back length and a closer fit through the body.

• Coastal Breeze offers the roomiest chest and one of the longer back lengths in the collection.

• Starlight features a mock neckline and may feel more fitted around the neck than other styles.

For the most accurate recommendation, use Find My Fit directly on the product page you’re shopping.

Find My Fit

For the most personalized recommendation, use Find My Fit on each product page.

Enter your pup’s chest, neck, back length, and weight, and we’ll recommend the most suitable size based on that style’s individual fit.

A Note on Measurements

Because every pup is shaped differently, measurements should be used as a guide rather than an exact guarantee of fit.

Please measure your pup carefully and use the individual product’s Find My Fit tool before ordering.

Still unsure? Contact us with your pup’s chest, neck, back length, and weight, and we’ll help you double-check the fit.

Chest Girth

Measure around the widest part of your pup’s chest, just behind the front legs.

Neck

Measure around the base of the neck where the garment naturally sits.

Back Length

Measure from the base of the neck to the base of the tail along the spine.

Weight

Use your pup’s current weight as a secondary reference. Chest and neck measurements should remain your primary guide.

Measure Naturally

Measure your pup while standing naturally.

Keep It Snug

Keep the measuring tape comfortably snug — not tight.

Chest & Neck First

Chest and neck are the most important measurements for fit.

Between Sizes?

Choose the size that comfortably accommodates both the chest and neckline.

Cherry Kiss

A shorter-back style with a closer fit through the body.

Blue Bloom

A balanced fit with more room through the chest than our more fitted styles.

Coastal Breeze

The roomiest style in the collection, with a fuller chest and longer back length.

Starlight

A mock-neck style with a closer fit around the neckline.

Frequently Asked Questions

What if my pup is between sizes?

Choose the size that comfortably accommodates both the chest and neckline. If your pup has a longer back, prioritize chest and neck first — back length may affect coverage, but it doesn’t always mean you should size up. For the most accurate recommendation, use Find My Fit on the product page.

Are all styles cut the same?

No. Each dear thomas style is designed a little differently. Some styles are more fitted through the body or neckline, while others offer more room through the chest or a longer back length.

What if I’m still unsure about the fit?

Use Find My Fit on the product page for the most personalized recommendation. If you’re still unsure, contact us with your pup’s chest, neck, back length, and weight, and we’ll be happy to help you double-check the fit.