Staffy Weight Chart

BySteven Cahill

Staffy Weight Chart: What to Expect at Every Age

An adult male Staffy typically weighs 13–17.25 kg (28–38 lb) and stands 36–41 cm (14–16 in) at the shoulder. Adult females are slightly smaller at 11–15.25 kg (24–33.5 lb) and 35.5–40.75 cm (14–16 in). Most Staffies reach their final height by around 12 months but keep filling out with muscle until 18–24 months.

Those numbers come from the official Kennel Club breed standard — not a guess, and not a competitor’s copy-pasted spreadsheet. Below is the full growth curve by age, in kg and lb, plus what actually happens to a Staffy’s body at each stage.

Adult Size at a Glance

Male (Dog)

Female (Bitch)

Weight

13–17.25 kg (28–38 lb)

11–15.25 kg (24–33.5 lb)

Height at Withers

36–41 cm (14–16 in)

35.5–40.75 cm (14–16 in)

Worth knowing: this is a breed standard — the ideal used for judging show dogs — not a hard rule for a healthy pet. The Kennel Club’s own guidance for prospective buyers says explicitly that a dog may be larger or smaller than the standard states. Plenty of much-loved, perfectly healthy companion Staffies sit outside this range, especially neutered dogs and dogs from working or “old-style” bloodlines, which tend to run a bit heavier and taller than the show standard. If your dog is outside these numbers but your vet is happy with their body condition, there’s nothing to worry about.

Staffy Growth Chart by Age

The table below estimates typical weight ranges from puppyhood to full maturity, based on the percentage of adult weight a Staffy has usually reached at each age. Individual dogs vary — genetics, sex, neutering age, and diet all play a part — so treat this as a guide, not a target.

Age

Male weight (kg)

Male weight (lb)

Female weight (kg)

Female weight (lb)

8 weeks

2–3.5 kg

4–8 lb

1.5–3 kg

3.5–6.5 lb

3 months

3.5–5 kg

7.5–11 lb

3–4.5 kg

6–10 lb

4 months

4.5–7 kg

10–15 lb

4–6 kg

8.5–13 lb

5 months

6–8.5 kg

13–19 lb

5–7.5 kg

11–16.5 lb

6 months

7–10.5 kg

15.5–23.5 lb

6–9.5 kg

13–21 lb

8 months

9–13.5 kg

20–29.5 lb

7.5–12 kg

17–26 lb

10 months

10.5–15.5 kg

23–34 lb

9–13.5 kg

20–30 lb

12 months

11.5–16.5 kg

25.5–36 lb

10–14.5 kg

22–32 lb

18 months

12.5–17.5 kg

27.5–38 lb

10.5–15.5 kg

23.5–33.5 lb

24 months (mature)

13–17.25 kg

28–38 lb

11–15.25 kg

24–33.5 lb

What’s Actually Happening at Each Growth Stage

  • 0–3 months — rapid early growth. Puppies gain weight fastest in these first few months, often more than doubling their birth weight within weeks. Bone and joint development is happening quickly here, which is why vets advise against high-impact exercise (repeated jumping, forced long walks, running on hard surfaces) at this stage — the “rule of thumb” most vets use is roughly five minutes of structured exercise per month of age, twice a day.
  • 3–6 months — the gangly stage. This is when Staffy puppies often look a bit awkward — legs and frame growing faster than the muscle fills in around them. It’s completely normal and temporary.
  • 6–12 months — filling out begins. Height growth slows noticeably, and this is when a Staffy starts to look more like an adult — broader chest, more defined muscle, the classic blocky head shape becoming more pronounced.
  • 12–18 months — height is essentially done. Most Staffies have reached their adult height by 12 months, though many keep adding muscle and bulk through to 18 months.
  • 18–24 months (and sometimes beyond) — final maturity. Some Staffies, particularly males, continue to add small amounts of muscle mass up to two or even three years old. This is the “filling out” owners often notice well after their dog has technically stopped growing taller.

When Do Staffies Stop Growing?

Short answer: most Staffies reach their full height by around 12 months, but don’t finish filling out with muscle and bulk until 18–24 months. A small number of dogs, especially males, keep adding muscle mass to around 3 years old. If your Staffy is well past 2 years old and still visibly gaining weight, that’s worth mentioning to your vet — at that point it’s more likely to be condition (weight gain) than growth.

As your Staffy moves through these growth stages, their training needs shift to – our complete Staffy puppy training guide covers what to focus on at each stage.

What Affects How Big Your Staffy Gets?

A few things influence where in the range your dog will land:

  • Genetics. A puppy’s parents are the single best predictor of adult size — if you can see the parents (or their weights), that’s more useful than any chart.
  • Sex. Males are consistently larger than females across the whole growth curve, not just at adulthood.
  • Neutering age. Dogs neutered before growth plates close (roughly 12–18 months) can end up slightly taller and leaner than they would have otherwise, since sex hormones play a role in when growth plates close. This is a discussion to have with your vet, not a reason to delay or rush the decision on other grounds.
  • Nutrition. Overfeeding a puppy to make them grow faster doesn’t produce a bigger, healthier adult — it increases the risk of joint problems. (Our feeding chart guide covers how much to actually feed at each age and weight.)

Is My Staffy Under or Overweight?

Weight charts are a guide, not a diagnosis. The more reliable check is body condition, not the number on the scale:

  • You should be able to feel your Staffy’s ribs easily under a light layer of fat, without them being visibly sharp.
  • Looking from above, there should be a visible waist behind the ribs.
  • From the side, the belly should tuck up behind the ribcage, not hang level with the chest.

If your Staffy’s tracking underweight or overweight, portion size is usually the first thing to check – see how full feeding chart by weight and age for exact daily amounts.

If you’re still unsure, ask your vet for a body condition score (BCS) check at your next visit — it takes thirty seconds and is far more accurate than comparing your dog to a chart.

Frequently Asked Questions

Adult males typically weigh 13–17.25 kg (28–38 lb); adult females typically weigh 11–15.25 kg (24–33.5 lb), per the Kennel Club breed standard.

Most reach full height by around 12 months and finish filling out with muscle by 18–24 months. Some continue adding muscle mass to around 3 years old.

Yes, noticeably. American Staffordshire Terriers (Amstaffs) typically weigh 18–32 kg (40–70 lb) — considerably heavier than a Staffy. (See our full [Staffy vs American Staffordshire Terrier comparison].)

Yes — this is a completely normal stage where frame growth outpaces muscle development. It resolves on its own as the dog matures.

Sometimes slightly taller, due to the effect of sex hormones on growth plate closure timing — but this is a minor effect and not a reason to make a neutering decision either way.

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2 Comments

    1. Hi Laura,

      Thanks for sharing this, and I’m sorry to hear your girl has been losing weight. At 14, noticeable weight loss is worth taking seriously. The weight chart in this article is a guide for healthy adult Staffies, so it can’t tell you what’s going on with a senior dog.

      I’d book her in for a vet check soon rather than waiting to see if she bounces back.

      It will help your vet if you note down:

      – Whether her appetite has changed, or she’s eating but still losing weight
      – Whether she’s drinking or toileting more than usual
      – Any bad breath, drooling or dropping food
      – Any lumps, changes in energy, or stiffness getting up

      If you can, weigh her at home or at the vet so you have a number to track.

      I hope she’s feeling better soon.

      Steve (and Guinness)

      Reply

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