Shih Tzu Ideal Weight and Diet

Adult standard 4.1 kg–7.3 kg (9 lb–16 lb). A neutered adult in the middle of that range needs about 413 kcal a day. Small breed, Toy group, typically 10–18 years.

Feeding a Shih Tzu

413 kcal a day

Cups a day: 1.1
Per meal (×2): 207 kcal
Resting need: 258 kcal
Breed standard: 4.1–7.3 kg

4.1 kg within the breed standard 7.3 kg

Daily calories by life stage

Daily calorie needs for a Shih Tzu by life stage
Life stage	Factor	Per day	Cups
Neutered adult	×1.6	413 kcal	1.1
Intact adult	×1.8	465 kcal	1.2
Obesity-prone	×1.4	362 kcal	1.0
Weight loss	×1.0	258 kcal	0.7
Puppy under 4 months	×3.0	775 kcal	2.0
Puppy 4-12 months	×2.0	516 kcal	1.4

This is a starting point, not a prescription. Breed standards are ranges and calorie formulas are estimates that a vet refines by watching the animal. Talk to your veterinarian before changing a diet, and especially before starting a weight-loss plan — sudden weight change can itself be a symptom worth investigating.

What the standard actually says

The AKC standard for the Shih Tzu gives an adult weight of 4.1 kg–7.3 kg and a height of 23–27 cm (9–11 in) at the shoulder. That spread is not sloppiness — it covers the difference between a small female and a large male of the same breed, and both are correct.

Calories follow weight, but not in a straight line. Energy need scales with bodyweight to the power of 0.75, not to the power of one. A dog at the top of this range needs 54% more food than one at the bottom, even though it weighs 78% more. That is why feeding by eye across two dogs of the same breed goes wrong so easily.

Neutering matters more than most owners expect. The same Shih Tzu needs about 465 kcal intact and 413 kcal neutered — roughly 11% less. Feeding the old amount after the operation is one of the commonest routes to a slowly overweight dog.

Across the breed's weight range

Shih Tzu calorie needs across the breed standard
Point in range	Weight	Pounds	Resting need	Neutered adult
Bottom of standard	4.1 kg	9 lb	202 kcal	323 kcal
Middle of standard	5.7 kg	13 lb	258 kcal	413 kcal
Top of standard	7.3 kg	16 lb	311 kcal	497 kcal

By life stage

Shih Tzu calorie needs by life stage
Life stage	Factor	Per day	Cups
Neutered adult	×1.6	413 kcal	1.1
Intact adult	×1.8	465 kcal	1.2
Obesity-prone	×1.4	362 kcal	1.0
Weight loss	×1.0	258 kcal	0.7
Puppy under 4 months	×3.0	775 kcal	2.0
Puppy 4-12 months	×2.0	516 kcal	1.4

At 5.7 kg, the middle of the standard. Cups assume 380 kcal per cup — check your own bag.

Frequently asked questions

How much should a Shih Tzu weigh?

The AKC breed standard puts an adult Shih Tzu between 4.1 kg and 7.3 kg — 9 lb to 16 lb. That is a range rather than a target: a dog at the bottom of it is not underweight and one at the top is not overweight. Frame, sex and body condition all move the right figure for an individual dog, which is why vets judge body condition score rather than the scales alone.

How many calories does a Shih Tzu need a day?

A neutered adult at the middle of the standard (5.7 kg) needs roughly 413 kcal a day — about 1.1 cups of typical dry food at 380 kcal per cup. An intact dog of the same size needs closer to 465, and a puppy under four months around 775.

How is the calorie figure worked out?

Resting Energy Requirement is 70 × bodyweight in kilograms to the power of 0.75, the standard allometric formula. That is then multiplied by a life-stage factor — 1.6 for a neutered adult, 1.8 intact, 3.0 for a puppy under four months. It is a starting point that a vet adjusts by watching how the dog responds, not a prescription.

How much should I feed a Shih Tzu to lose weight?

A weight-loss plan is fed to the target weight, not the current one — feeding maintenance calories for a body the dog already has is why diets stall. Select "weight loss" in the calculator and enter the target your vet agreed. Never start a weight-loss diet without that conversation: rapid loss is dangerous, and sudden weight change can itself be a symptom.

How long do Shih Tzus live?

The AKC gives a typical lifespan of 10–18 years for the Shih Tzu. Keeping a dog at a lean body condition through its life is one of the few things shown to extend it.

Breed standard: American Kennel Club breed standards. Energy formula: Merck Veterinary Manual, nutritional requirements of small animals.

Estimates for informational purposes only and not veterinary advice. Breed standards are ranges, not targets, and healthy weight varies with frame, age, neuter status and body condition score. Calorie formulas are a starting point that a vet adjusts by watching how the dog responds. Talk to your veterinarian before changing a diet, and especially before a weight-loss plan.