Shih Tzu weight predictor
AKC standard: 9–16 lb. A true small breed — adult weight is reached by ~10 months.
Typical adult: 9–16 lb · grown by ~10 months
Predicted adult weight
Fully grown—
likely —
Enter your puppy’s weight and age.
That doesn’t look right
Your puppy’s growth curve
Estimated weight as they grow up — the dot is where they are now.
| Age | Est. weight |
|---|
Good to know
General guidance only — an estimate, not veterinary advice. Always check with your vet about your pet’s growth, weight and diet.
How this was calculated
For a Shih Tzu we use the small-breed growth curve (matures around 10 months): adult weight ≈ current weight ÷ the fraction of adult weight a small breed reaches at this age. Typical adult weight (9–16 lb) is from the AKC breed standard. The gauge shows where your prediction lands against the breed-typical adult range.
Source: AKC breed standard + WALTHAM growth charts. Full method on our methodology page.
Built by the PawGauge team, reviewed against cited veterinary sources. Last reviewed 29 June 2026.
About our figures →Shih Tzu growth chart
Typical Shih Tzu weight from 8 weeks to fully grown. A healthy Shih Tzu tracks near these figures — individuals sit up to ~10–15% either side.
| Age | Typical |
|---|---|
| 8 weeks | 4.5 lb (2.0 kg) |
| 3 months | 6.5 lb (2.9 kg) |
| 4 months | 8 lb (3.6 kg) |
| 5 months | 9.1 lb (4.1 kg) |
| 6 months | 10 lb (4.5 kg) |
| 7 months | 10.8 lb (4.9 kg) |
| 8 months | 11.5 lb (5.2 kg) |
| 9 months | 12 lb (5.4 kg) |
| Adult (~10 mo) | 9–16 lb (4.1–7.3 kg) |
Shih Tzu growth, explained
Shih Tzus are a small breed, so they follow the small-breed growth curve. AKC standard: 9–16 lb. A true small breed — adult weight is reached by ~10 months. Most reach close to their adult weight by around 10 months, then continue to firm up in muscle and chest for a while after.
To predict an adult weight we divide your puppy’s current weight by the fraction of adult weight a small breed has typically reached at that age. Typical adult weight (9–16 lb) is from the AKC breed standard. The result is an estimate with a likely range — genetics and nutrition move individual dogs up or down. If your Shih Tzu looks heavier or lighter than the breed-typical band, your vet is the best person to check.
Shih Tzu weight questions
- How big do Shih Tzus get?
- A typical adult Shih Tzu weighs about 9–16 lb. AKC standard: 9–16 lb. A true small breed — adult weight is reached by ~10 months.
- What should a Shih Tzu weigh by age?
- See the Shih Tzu growth chart above for weight at 8 weeks through to adult. As a guide, a small-breed puppy is roughly half its adult weight by about 4 months.
- Do male and female Shih Tzus weigh differently?
- Males average slightly heavier than females, but the Shih Tzu standard gives a single 9–16 lb range rather than a split, so the chart shows one typical curve.
- When is a Shih Tzu fully grown?
- Shih Tzus are a small breed and usually finish growing around 10 months, though they may keep filling out a little after that.
- How accurate is this for a Shih Tzu?
- Within about 10–15% if your puppy is a typical Shih Tzu. Crossbreeds, runts and big-boned individuals vary more. It’s an estimate — your vet can assess your individual dog.
