West Highland Terrier weight chart
A fully grown West Highland White Terrier typically settles at around 7 to 10kg, standing roughly 28cm at the shoulder, with males usually toward the top of that range and females toward the bottom. Most Westies reach close to their adult weight by around ten to twelve months old, though they can keep filling out slightly for a few months after that.
Reading a Westie's growth
Like most small terriers, Westies do almost all of their growing in the first six to eight months, then slow down and spend the next few months filling out and finishing their coat and frame rather than gaining much further height or weight. A weight chart for the breed is really tracking two different things at once — how big the dog is getting, and how quickly that growth is slowing down, which is the more useful figure once a puppy is past about four months old.
Most Westies are close to their full adult weight by around ten to twelve months, settling within the 7 to 10kg range typical for the breed, with dogs on the smaller end of that range often being female and those on the larger end more often male, though there is plenty of individual variation either way.
What affects where a Westie sits in that range
Where an individual Westie lands within that 7 to 10kg range has more to do with its parents' size and its own genetics than anything an owner does. A Westie from a smaller-boned line will likely stay smaller as an adult regardless of how it is fed, and pushing food at a naturally smaller dog to hit a number on a chart does it no favours.
Body condition matters more than the number on the scale. A vet or an experienced groomer will usually check whether the ribs can be felt easily under a light covering of fat, and whether there is a visible waist when the dog is looked at from above — a Westie that meets both of those is in good shape whether it weighs 7.5kg or 9.5kg.
When a Westie's weight is worth a second look
A Westie that suddenly drops or gains weight outside its normal pattern, rather than one that simply sits at the upper or lower end of the typical range, is the thing worth paying attention to. A steady, slow decline in bodyweight, or a rapid gain over a few weeks with no change in diet, is a more useful signal than comparing the dog to an average chart figure.
If your Westie's weight changes noticeably without an obvious reason — a different food, more or less exercise, or a change in routine — it's worth mentioning at your next vet visit rather than assuming it will settle on its own, particularly in an older dog where weight change can be one of the first visible signs that something else needs looking at.
Common questions
- How much should a fully grown Westie weigh?
- Most adult West Highland White Terriers settle somewhere between 7 and 10kg, with males typically at the higher end of that range and females at the lower end. Individual dogs vary, and body condition matters more than hitting an exact number.
- When does a Westie stop growing?
- Most of a Westie's growth happens in the first six to eight months, with the breed generally reaching close to its adult weight by around ten to twelve months old. Some dogs continue to fill out slightly in the months after that, particularly around the chest and coat.
- Is my Westie underweight or overweight?
- Rather than relying on the scale alone, check whether you can feel the ribs under a light covering of fat and whether there's a visible waist from above. A Westie that meets both is generally in good condition regardless of exactly where its weight sits within the typical range for the breed.
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Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.