How to Measure a Small Dog for a Winter Coat (and Get the Size Right)

Small dogs lose heat faster than big ones, and many toy breeds have thin coats to begin with. A good winter layer helps, but only if it fits. Sizes vary between brands, so measuring takes the guesswork out of it.

What you need

A soft tape measure (or a piece of string and a ruler), a few treats, and your dog standing on all four paws.

The three measurements

• Neck: measure around the base of the neck, where a collar would sit.
• Chest: measure around the widest part of the ribcage, just behind the front legs. This is the most important number for coats and sweaters.
• Back length: measure from the base of the neck (between the shoulder blades) to the base of the tail.

Write all three down and compare them with the size chart on the product page. Weight ranges are useful as a rough guide, but chest size decides the fit.

Between sizes? Size up

A coat that's a little roomy can still be comfortable. One that's too tight can rub under the legs and restrict movement. Deep-chested breeds like Frenchies and Pugs often need to size up for the chest.

The two-finger fit check

With the layer on, you should be able to slide two fingers under it at the neck and chest. Watch your dog walk, sit and lie down: they should move normally, and the coat shouldn't twist or ride up.

Features that actually help

• A waterproof shell for rain, slush and snow. The Waterproof Winter Jacket with Built-In Harness pairs a waterproof outer with a soft fleece lining.
• A built-in harness or leash ring so you're not layering a harness over a puffy coat. The Reversible Puffer Vest has a metal leash ring on the back.
• Reflective details for dark winter evenings.
• Plush fleece for dogs who run cold indoors, too. Try the Sherpa Pullover, which starts at size XS for the tiniest pets, or the Teddy Fleece Hoodie.

Getting your dog used to it

Put the coat on for short, happy moments first, with treats and praise, and then head straight out for a walk so it means something good. Take it off indoors if your dog starts to pant or seems too warm, and always supervise at first.

See every cold-weather layer in our Dogs collection. New here? Use code WELCOME for 10% off your first order.