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Medium dog harnesses are typically sized for a chest (girth) of about 23–28 inches (some product specs list 24–28 inches). Use that range as the guide when selecting a medium.

Measure the full circumference around the largest part of your dog’s chest (right behind the front legs) using a soft tape measure or a string. Keep the tape snug but not tight, note the measurement, and pick the harness size that matches that chest girth.

Medium harnesses are typically sized for dogs around 25–65 pounds, and some product specifications list a holding capacity of about 60 pounds.

Closures are typically buckle-style or clip-in clasps. Harnesses commonly offer both front and back leash attachment points, and some training packages include a double-ended leash to connect to both points.

Some harnesses use a martingale-style (action) loop on the back that tightens gently around the chest to discourage pulling. Many also include a front leash ring to allow steering and additional control.

Care varies by style: many nylon harnesses list hand wash, some are machine washable, and comfort/reflective styles may recommend spot or wipe cleaning. Check the product label for the manufacturer’s specific care instructions.

A medium training package typically includes the harness plus training instructions and a double-ended training leash; some packages also list a training brochure and fitting/warranty information.