Tosa Growth Chart
Expected weight by age, week by week
Tosa puppies grow at a fairly predictable rate as a percentage of their eventual adult size. Use this table as a general guide - every puppy is different.
| Age | Male weight | Female weight |
|---|---|---|
| 4 weeks (~0.9 mo) | 4–6.7 kg (8.7–14.8 lb) | 4–6.7 kg (8.7–14.8 lb) |
| 8 weeks (~1.8 mo) | 7.2–12.2 kg (15.9–26.9 lb) | 7.2–12.2 kg (15.9–26.9 lb) |
| 12 weeks (~2.8 mo) | 11.9–20.1 kg (26.2–44.4 lb) | 11.9–20.1 kg (26.2–44.4 lb) |
| 16 weeks (~3.7 mo) | 16.2–27.5 kg (35.7–60.5 lb) | 16.2–27.5 kg (35.7–60.5 lb) |
| 20 weeks (~4.6 mo) | 19.8–33.6 kg (43.7–74 lb) | 19.8–33.6 kg (43.7–74 lb) |
| 24 weeks (~5.5 mo) | 23.4–39.7 kg (51.6–87.4 lb) | 23.4–39.7 kg (51.6–87.4 lb) |
| 28 weeks (~6.4 mo) | 26.3–44.5 kg (57.9–98.2 lb) | 26.3–44.5 kg (57.9–98.2 lb) |
| 32 weeks (~7.4 mo) | 28.8–48.8 kg (63.5–107.6 lb) | 28.8–48.8 kg (63.5–107.6 lb) |
| 36 weeks (~8.3 mo) | 30.6–51.9 kg (67.5–114.3 lb) | 30.6–51.9 kg (67.5–114.3 lb) |
| 40 weeks (~9.2 mo) | 32.4–54.9 kg (71.4–121 lb) | 32.4–54.9 kg (71.4–121 lb) |
| 44 weeks (~10.1 mo) | 33.5–56.7 kg (73.8–125.1 lb) | 33.5–56.7 kg (73.8–125.1 lb) |
| 48 weeks (~11 mo) | 34.6–58.6 kg (76.2–129.1 lb) | 34.6–58.6 kg (76.2–129.1 lb) |
| 52 weeks (~12 mo) | 35.3–59.8 kg (77.8–131.8 lb) | 35.3–59.8 kg (77.8–131.8 lb) |
Common questions
How much should a Tosa weigh at 3 months old?
At around 12 weeks (3 months), a Tosa puppy typically weighs about a third of their eventual adult weight - roughly 11.9–20.1 kg for males and 11.9–20.1 kg for females, based on this breed's adult weight range of 36–61 kg (male) and 36–61 kg (female).
When does a Tosa stop growing?
Most Tosas reach close to their full adult weight by around 12 months old, though large breeds can continue filling out in muscle and chest depth for several months after that. Larger breeds generally take longer to fully mature than smaller ones.
My Tosa puppy seems small/large for their age, should I worry?
Individual puppies vary, and these figures are typical ranges, not strict rules - genetics, litter size, and nutrition all play a part. If your puppy is well outside these ranges, gaining or losing weight rapidly, or you're generally concerned, check with your vet rather than relying on any online chart alone.
Track your own puppy's growth
Log real weigh-ins and see how your puppy compares to this curve, right in the app.
Try the Puppy Size Predictor