American Bulldog Size Chart
An adult male American Bulldog stands 22–27 inches at the shoulder and weighs 75–120 pounds. Females are smaller at 20–24 inches and 60–90 pounds. Most reach their full height by 12–14 months but continue filling out until 2–3 years old.
The single biggest mistake owners make with this size chart is relying on weight alone. American Bulldogs come in two distinct body types — the heavier Johnson line and the leaner Scott line — so a 90-pound male can be perfectly healthy or noticeably overweight depending on which line he comes from. The body condition check below is more reliable than the number on the scale.
American Bulldog Weight & Height Chart by Age
| Age | Male Weight | Female Weight | Notes |
|---|---|---|---|
| 8 weeks | 12–18 lbs | 10–15 lbs | Beginning of rapid growth |
| 3 months | 25–35 lbs | 20–30 lbs | Teething stage — chewing is normal |
| 6 months | 45–60 lbs | 35–50 lbs | Largest growth rate; increase food gradually |
| 9 months | 60–80 lbs | 50–65 lbs | Growth slowing; don’t overfeed to “finish” growth |
| 12 months | 70–100 lbs | 55–75 lbs | Height mostly done; waiting on chest width and muscle |
| 18 months | 75–110 lbs | 60–85 lbs | Still adding muscle mass |
| 24 months | 75–120 lbs | 60–90 lbs | Full adult size; maintain weight, not increase |
Height ranges: Males 22–27 inches, Females 20–24 inches at the shoulder.
How to Tell If Your American Bulldog Is a Healthy Size
You can’t just use the scale. American Bulldogs are blocky, muscular dogs where breed type varies between two lines:
- Standard (Johnson) type — heavier, wider chest, closer to 100–120 lbs for males
- Performance (Scott) type — leaner, more athletic, closer to 75–90 lbs for males
A healthy American Bulldog should have:
- A visible waist when viewed from above (behind the ribs)
- Ribs you can feel with light pressure but not see
- No fat pads over the hips or tail base
- Clear muscle definition along the shoulders and hind legs
If you can see the ribs easily, your dog is underweight. If you can’t feel ribs at all, it’s time to reduce portions.
When Do American Bulldogs Stop Growing?
Most American Bulldogs reach their full height by 12–14 months. But here’s the part owners miss: they keep building muscle mass until 2–3 years old. A 1-year-old American Bulldog often looks “lanky” compared to a 2-year-old. That’s normal.
Growth checkpoints:
- 8–16 weeks — fastest growth rate; need a large-breed puppy food to control growth speed
- 4–9 months — steady bone lengthening; expect a “leggy” phase
- 10–14 months — height plateaus; chest and head width increase
- 15–24 months — muscle filling; dog matures into adult proportions
- 3 years — fully mature in both height and weight
3 Expert Tips for Keeping Your American Bulldog at a Healthy Size
Tip 1: Measure Height the Right Way Every Time
Actionable step: Use a carpenter’s level or a hardcover book placed on your dog’s withers (the ridge between the shoulder blades) while they stand square on a level floor. Mark the wall at the bottom of the book, then measure from floor to mark. Do this monthly during the first year.
Common mistake: Guessing height by eye or measuring at the top of the head. The shoulder is the standard reference point — measuring the head adds 2–4 inches and gives you useless numbers for chart comparison.
Tip 2: Adjust Portions Based on Body Condition, Not the Bag
Actionable step: Once your Bulldog is over 6 months, check the waist and rib feel every two weeks. If you can’t feel ribs, cut daily food by 10% and reassess after 7 days. If ribs are visible, increase by 10%.
Common mistake: Following the feeding guide on the kibble bag blindly. Most large-breed kibble bags overestimate portions for American Bulldogs, especially if your dog is less active. Always use body condition as the final guide, not the bag’s “recommended for 60–100 lbs” range.
Tip 3: Weigh at the Same Time Each Week — Same Scale, Same Routine
Actionable step: Weigh your dog every Sunday morning before breakfast using a bathroom scale (weigh yourself, pick up the dog, subtract). Track in a simple notebook or a phone note app. Sudden jumps or drops of more than 5% in one week warrant a closer look.
Common mistake: Only weighing at vet visits. A once-a-month weigh-in can hide steady weight gain that creeps up over 4–6 weeks. Weekly weighing catches the trend before it becomes a problem.
Feeding an American Bulldog to Match Its Size
Underfeeding a growing Bulldog risks developmental issues. Overfeeding risks joint damage and obesity. Match feeding to the chart above.
| Age | Meals per Day | Daily Food Amount (high-quality large-breed kibble) |
|---|---|---|
| 8–12 weeks | 3–4 meals | 2–3 cups total |
| 3–6 months | 3 meals | 3–4 cups total |
| 6–12 months | 2 meals | 4–5 cups total |
| 12+ months | 2 meals | 4–6 cups total (adjust for activity) |
Actionable tip: Use a slow-feed bowl or a puzzle feeder like the Outward Hound Fun Feeder to prevent gulping and reduce bloat risk. Dogs that inhale food are more likely to swallow air, which can lead to stomach torsion.
Size-Related Health Risks to Watch For
American Bulldogs are a large, heavy-chested breed. Their size creates specific health risks:
Bloat (GDV)
- Deep chest + large meals = high risk
- Signs: unproductive retching, distended belly, restlessness
- Call the vet immediately — time is measured in hours
Hip and elbow dysplasia
- Common in heavy breeds; excess weight makes it worse
- Keep your dog lean during the first 2 years of bone development
- Watch for: bunny-hopping gait, stiffness after lying down, unwillingness to jump
Joint stress in overweight dogs
- Each extra pound on a 90-lb Bulldog adds about 4 lbs of pressure on hip joints
- An overweight American Bulldog at 110 lbs is carrying roughly 80 extra pounds of joint load
How to Track Your American Bulldog’s Growth — A Step-by-Step Flow
Use this simple routine to catch problems early.
Step 1: Weekly weigh-in. Use the bathroom scale method on the same day each week. Note the number.
Step 2: Monthly body condition check. Feel the ribs and check the waist. If ribs are hard to find, mark a flag. If ribs are visible, mark a different flag.
Step 3: Monthly photo from above and the side. Stand over your dog and take a picture looking down. Compare month to month — a disappearing waist is a clear warning.
Likely cause of slow growth or weight loss: Worms, wrong food (not large-breed puppy formula), or overfeeding treats. Check stool consistency and appetite.
Likely cause of weight gain past the chart: Too many calories from treats or table scraps, or sedentary lifestyle. Cut back on extras first.
Escalation signal: If your dog loses weight without losing appetite, or develops a sudden potbelly with a thin waist, see a vet within the week. That pattern does not mean “normal growth phase.”
What to Do If Your American Bulldog Is Off the Chart
The chart above gives averages. Some Bulldogs run larger or smaller depending on genetics. But here’s the key difference:
Larger than max? Likely overweight, not oversized. Trim food by 10% and reassess after two weeks. If the dog maintains the same weight at lower calories, you may have a genuinely large-framed dog from a Johnson line.
Smaller than min? Could be underweight or undersized. Check:
- Are ribs visible? If yes, increase food portion and check for worms
- Is your dog from a Scott (performance) line? Those can run 65–75 lbs fully grown — healthy but smaller
- Has your dog reached 2 years yet? Some Bulldogs fill out late
When in doubt, your vet can assess body condition score (BCS) — a 9-point scale — and tell you exactly where your dog sits.
FAQs About American Bulldog Size
How big do American Bulldogs get?
Males reach 22–27 inches tall and 75–120 pounds. Females reach 20–24 inches and 60–90 pounds. Full size takes 2–3 years.
What’s the difference between American Bulldog and English Bulldog size?
American Bulldogs are significantly larger: English Bulldogs rarely exceed 50–55 lbs and stand 14–16 inches tall. American Bulldogs are also more athletic and less stocky.
At what age is an American Bulldog fully grown?
Height is mostly set by 12–14 months, but muscle and chest width continue developing until 2–3 years old.
How much should I feed my American Bulldog puppy?
Feed 2–4 cups of large-breed puppy food daily, split into 3–4 meals for young puppies and 2 meals from 6 months onward. Use the feeding chart above and adjust for activity level.
Can an American Bulldog weigh 150 pounds?
Extremely rare. A 150-lb Bulldog is almost always overweight, not naturally large. Healthy American Bulldogs top out around 120 lbs.
Is my American Bulldog too skinny?
If you see individual ribs, your dog is underweight. If you can feel ribs with light pressure but don’t see them, the weight is appropriate. If you can’t easily feel ribs, your dog needs fewer calories.
Save This Guide
This chart provides a reference for checking your American Bulldog’s growth at every stage. The most important takeaway: keep your Bulldog lean during the first two years to protect their joints, and feed measured meals on a schedule to reduce bloat risk. A healthy American Bulldog has visible waist definition, feels muscular, and stays within the weight ranges above — not because the scale says so, but because their body condition score is right.
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