Use this Tosa puppy weight calculator to predict how big your puppy will get. Tosas are a giant guardian breed that keeps growing until around 24-36 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
Slows fast eaters, can aid digestion, holds 4 cups dry or wet food — sized for giant breeds.
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| Age | Weight |
|---|---|
| Birth | 2 to 7 lbs |
| 2 Months | 8 to 20 lbs |
| 3 Months | 15 to 40 lbs |
| 4 Months | 25 to 60 lbs |
| 5 Months | 35 to 80 lbs |
| 6 Months | 45 to 100 lbs |
| 7 Months | 55 to 120 lbs |
| 9 Months | 65 to 140 lbs |
| 10 Months | 75 to 160 lbs |
| 1 Year | 85 to 180 lbs |
| 1.5 Years | 95 to 200 lbs |
| 2 Years | 100 to 200 lbs |
Estimated from typical giant-breed growth curves and the Tosa's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Prone to hip and elbow dysplasia given the breed's massive size; as a deep-chested breed, bloat risk also applies.
A large-breed puppy formula through the (notably slow) growth period; adults do well on a quality diet with careful portion control.
The short coat needs minimal brushing.
Requires an experienced, confident handler and rigorous early socialization given the breed's size, strength, and guarding history — genuinely not a breed for a first-time or casual owner, and restricted or banned in some jurisdictions.
A Japanese Molosser-type breed developed in Tosa (present-day Kochi Prefecture), historically bred for a now-banned fighting tradition, combining Japanese and Western mastiff-type bloodlines.
Patient, composed, and courageous, Tosas are calm guardians that carry genuine physical power and require a very experienced, confident handler.
