Size Chart: How Big Will a Shih Tzu Get?

Most Shih Tzus grow up to weigh between 9 and 16 pounds and stand about 9 to 10.5 inches tall at the shoulder. That is the ideal range in the American Shih Tzu Club breed standard, and it is where the large majority of well-bred Shih Tzus land.

The standard allows a little room on either side — not under 8 inches and not over 11 inches at the shoulder. So a fully grown Shih Tzu is a genuinely small dog, but a solid one. The breed standard describes them as compact and sturdy, slightly longer than they are tall, and carrying a surprising amount of weight for their height when you pick them up.

That last part catches people off guard. A Shih Tzu is not a fragile dog. The coat makes them look bigger than they are, and the body underneath is denser than it looks.

Expected adult weight and height

• Weight: 9 to 16 pounds
• Height at the shoulder: 9 to 10.5 inches ideally; 8 to 11 inches acceptable
• Build: compact, slightly longer than tall, well-boned for the size

Males and females overlap heavily in this breed. A male may sit a little higher in the range, but it is not a reliable rule — the parents matter far more than the sex.

Shih Tzu weight by age

These are estimates, not promises. Puppies grow in spurts, and a puppy who sits at the top of one row may sit mid-range in the next. Use this to see whether your puppy is tracking sensibly over time, not to predict a final number to the ounce.

The steepest growth happens between about 8 weeks and 6 months. By six months, most Shih Tzus are carrying roughly two-thirds of their adult weight.

What affects how big a Shih Tzu gets

The parents, above all else. If you want to know how big a puppy will finish, look at the adult size of the mother and father. Genetics sets the ceiling and the floor. Everything else just moves a dog around inside that range. When you visit our showroom in Lawrenceville, ask us what we know about a puppy’s parents — that is the most honest size information anyone can give you.

Body condition. A Shih Tzu carrying extra weight will read heavier on the scale but is not actually a bigger dog. This matters more in this breed than in many others, because the flat-faced build means extra weight can make hot Georgia afternoons harder on them. Lean is kinder.

Nutrition through the growth window. Steady, appropriate puppy food supports normal growth. Overfeeding does not produce a larger adult dog; it produces a heavier one.

The coat is not size. A Shih Tzu in full coat looks considerably larger than the same dog after a puppy cut. Nothing about the dog changed.

When Shih Tzus stop growing

Most Shih Tzus reach their adult height between 8 and 10 months. Weight keeps settling a little longer — many fill out through the chest and finish around 10 to 12 months.

After the first year, changes are usually about condition rather than growth. If your one-year-old Shih Tzu is gaining steadily, that is a diet conversation, not a growth spurt.

Signs of healthy growth

• Gradual, steady gains rather than sudden jumps or stalls
• Ribs you can feel easily under a light layer, without pressing hard
• A visible tuck at the waist when viewed from above, once the coat is trimmed or parted
• Good energy, normal appetite, and comfortable movement
• Clean, level teeth coming in on schedule

When to ask a veterinarian

Talk to your veterinarian if your puppy stops gaining for more than a couple of weeks, loses weight, seems unusually tired, eats poorly, or grows much faster or slower than the ranges above. Very small puppies can also be prone to low blood sugar, so any wobbliness or unusual lethargy is worth a same-day call.

We are not able to diagnose or predict health outcomes — only your veterinarian can assess your individual dog. Every puppy here gets a complete health check from our on-staff veterinarian and is up to date on shots, and we will always tell you to take questions about growth to your own vet.

An honest note on “teacup”

People search for “teacup Shih Tzu” constantly, so let us be straightforward: “teacup” is not a recognized size. The national breed registry and the American Shih Tzu Club recognize one Shih Tzu. There is no teacup variety, no imperial variety, and no official standard below the regular one. Those words are marketing labels, and different sellers use them to mean very different things.

What we will do instead is give you an honest estimate based on the puppy in front of us and what we know about their parents, and tell you plainly when we are not sure. Some Shih Tzus do finish at the small end — around 8 or 9 pounds — and that is a normal small Shih Tzu, not a separate type.

If we do not have the size or coloring you are hoping for, ask about our waitlist. Showroom hours are Mon-Sat 12-7pm and Sunday 2-6pm, or call us at (678) 253-4081.