Shih Tzu Age Calculator
Your Shih Tzu's age in human years, breed-size adjusted, not the ×7 myth.
In human years
32
A 4-year-old small dog is about 32 in human years.
Advertisement
How the Shih Tzu ages
The Shih Tzu is a small dog weighing about 9–16 lb, with a typical lifespan of 12–14 years. Like all dogs, the Shih Tzu matures fast early: about 15 human years by age one and 24 by age two, and then ages more gradually after that. A 5-year-old is roughly 36 in human years, and a 10-year-old about 56. This size-adjusted method reflects how small dogs actually age, rather than the flat "multiply by seven" rule, which overstates the age of young pets and understates senior large breeds.
Quick reference
| Dog age | Human years |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 5 | 36 |
| 8 | 48 |
| 10 | 56 |
Other small breeds on the same curve
Every small dog gains the same human years per year after age two, so these pages share the curve and differ on weight and lifespan.
- Any small dog (13–25 lb)Use this if your dog is a mix
- Beagle20–30 lb, lives 12–15 yrs
- Bichon Frise12–18 lb, lives 12–13 yrs
- Boston Terrier12–25 lb, lives 11–13 yrs
- Cairn Terrier13–14 lb, lives 14–15 yrs
- Cavalier King Charles Spaniel13–18 lb, lives 11–13 yrs
- Cocker Spaniel20–30 lb, lives 13–14 yrs
Feeding a small breed dog
Age tells you the life stage; these size the daily portion that goes with it.
- Adult small breed portionsDaily calories and cups for a 13–25 lb dog
- Puppy small breed portionsDaily calories and cups for a 13–25 lb dog
- Senior small breed portionsDaily calories and cups for a 13–25 lb dog
Frequently asked questions
How old is my Shih Tzu in human years?
Enter your Shih Tzu's age above. As a guide, a small dog is about 15 at 1 year, 24 at 2, and 48 by age 8.
Do Shih Tzus age faster than smaller dogs?
Smaller dogs age more slowly after year two and tend to live longer. That's why we adjust the curve by size instead of using ×7.
Keep going with the same pet
See how much to feed your Shih Tzu next. The food calculator picks up the same saved pet.
Your cat's age in human years using the real feline curve, not the ×7 myth.
How much to feed: daily calories and cups by weight, activity and life stage.
Tank gallons and liters from your dimensions: rectangle, cylinder, hex and more.
Bioload-based stocking guidance, not the oversimplified 1-inch-per-gallon rule.