When is a Shih Tzu fully grown?

Most Shih Tzus reach close to their adult weight by 10–12 months of age. Some may continue to fill out slightly through 12–14 months, but the primary growth phase is complete by the end of the first year — consistent with small-breed maturation patterns.

How much should a 3-month-old Shih Tzu weigh?

A 3-month-old Shih Tzu typically weighs approximately 1.5–3 kg, depending on whether the individual will be a smaller or larger adult. There is significant normal variation. Your veterinarian can assess whether growth is on track at each wellness visit.

Should I feed my Shih Tzu puppy food or adult food?

Feed a puppy-formula food (ideally small-breed puppy) until around 10–12 months, then transition to a small-breed adult food. Puppy food has higher calorie density and different nutrient ratios suited to growth; adult food is appropriate once the dog has reached its adult size.

Shih Tzu Growth Chart: What to Expect | PetCalculator

Shih Tzus are a small breed that typically reaches adult size by 10–12 months. This guide covers growth milestones by age, what healthy growth looks like, and when to be concerned.