Pet Care Blog

Tibetan Mastiff Growth & Weight Chart: Size Guide By Age

Dr. Lila Batiari
Small Animal Relief Veterinarian
tibetan mastiff puppy on straw

Originally from Tibet, Tibetan Mastiffs are ancient dogs that act like gentle giants. Known for their massive size, powerful bodies, and watchful nature, their soft temperament can quickly shift into fierce protectiveness if anyone threatens their family.

If you have a puppy of this breed, you may be wondering how big do Tibetan Mastiffs get? Use our Tibetan Mastiff size chart below to learn more.

Here’s everything you need to know about Tibetan Mastiff size and growth rate:

Tibetan Mastiff Size Chart

Age Male Weight Female Weight
1 mo 5 - 10 lb 5 - 10 lb
2 mo 15 - 30 lb 10 - 25 lb
3 mo 30 - 45 lb 25 - 40 lb
4 mo 45 - 65 lb 30 - 45 lb
5 mo 50 - 75 lb 35 - 60 lb
6 mo 55 - 85 lb 40 - 60 lb
7 mo 60 - 90 lb 45 - 65 lb
8 mo 65 - 95 lb 50 - 70 lb
9 mo 70 - 105 lb 55 - 80 lb
10 mo 70 - 115 lb 55 - 90 lb
11 mo 75 - 125 lb 60 - 100 lb
12 mo 80 - 135 lb 60 - 110 lb
24 mo 90 - 150 lb 70 - 120 lb

All puppies develop at their own unique pace, so please remember that the Tibetan Mastiff growth rate may vary. The above numbers are estimates based on what the average Tibetan Mastiff weight by age.

If your Tibetan Mastiff puppy is significantly ahead or below these figures, please consult with your veterinarian to ensure your pet is healthy.

:star: Pro Tip: Pet parents can get reimbursed for up to 100% of out-of-pocket veterinary costs by signing up for a pet insurance plan. Compare Tibetan Mastiff health insurance options today so that you can have peace of mind knowing that any future health condition can be covered.

At what age is a Tibetan Mastiff fully grown?

As a giant dog breed, Tibetan Mastiffs need more time than most dogs to reach their full size. Most female and male Tibetan Mastiffs will need up to 18 months to reach their full size. However, the largest Tibetan Mastiffs may continue to fill out their chest and put on muscle for another six months or so1.

How big should a 6-month-old Tibetan Mastiff be?

A six month old male Tibetan Mastiff puppy will weigh around 55 to 85 pounds on average. In comparison, a six month old female Tibetan Mastiff puppy will typically weigh between 40 and 60 pounds.

two brown tibetan mastiff puppies

How much bigger will my Tibetan Mastiff get?

There are three ways to predict the size of a Tibetan Mastiff at maturity:

  1. Age. Your puppy's age is the most significant indicator of how much bigger they will get. If they're less than 18 months old, they're likely still growing. Between 18 and 24 months old, they may continue to put on some muscle, but their growth will probably have slowed down by this point.
  2. Genetics. Another key predictor of your Tibetan Mastiff’s size is how big their parents are. If you purchased your Tibetan Mastiff from a breeder, reach out to them about how large your puppy’s parents were and how large they expect your puppy to grow based on past litters.
  3. Paw Size. Lastly, you can take a look at your puppy’s paws. If their paws appear to be oversized next to their body and legs, they are probably still growing as this is a classic puppy feature.

What is the size of a full-grown Tibetan Mastiff?

According to the American Kennel Club Official Breed Standards2, a male Tibetan Mastiff should weigh between 90 and 150 pounds. In comparison, a female Tibetan Mastiff should weigh between 70 and 120 pounds at maturity.

Regarding the Tibetan Mastiff size in height, males stand between 26 and 29 inches tall. Comparatively, females should stand between 24 and 27 inches tall.

black tibetan mastiff adult dog

How do I make sure my Tibetan Mastiff is healthy?

Like most purebred dogs, Tibetan Mastiffs are more prone to several hereditary conditions3, including:

  • Hip dysplasia. Hip dysplasia is a painful condition in which the hip joint is loose, causing bones to fall out of place.
  • Hot spots. Dogs of this breed frequently experience acute dermatitis, commonly referred to as hot spots in dogs, if their burly coat is matted and poorly maintained.
  • Ear infections. The Tibetan Mastiff size creates big ear canals that can quickly cause ear infection in dogs due to the increased condensation trapped beneath their thick, heavy coat.
  • Ectropion. These dogs are also predisposed to have droopier eyelids, which makes them predisposed to dry eye and recurrent corneal ulcers. In severe cases, surgical intervention may be required.
  • Hypothyroidism. This condition occurs due to an under-active thyroid gland and results in hormonal imbalance. Dogs with hypothyroidism may experience low energy levels and issues with weight gain.
  • Progressive retinal atrophy. Abbreviated as PRA, this degenerative eye disease is commonly inherited by Tibetan Mastiffs. It affects the retina through slow deterioration of tissue cells, eventually leading to nighttime vision loss.

Many of these diseases are not detectable when your puppy is growing and may only appear later in their life, which is why regular veterinary care is so vital to your pup’s health. Routine veterinary appointments allow your veterinarian to screen your pet regularly for health concerns. They can provide you with personalized advice on how to provide your pup with the healthiest lifestyle, such as how to choose the best dog food specific to large-breed growth.

Tibetan Mastiff Veterinary Costs

Some conditions common to this breed can be very expensive to treat. For example, hip dysplasia treatment costs typically range between $1,200 to $7,000 per hip, depending on your dog’s overall condition. If both hips require surgery, this procedure could cost up to $14,000 when factoring in the expense of medications, anesthesia, bloodwork, and ongoing care after surgery.

In general, the Tibetan Mastiff size makes veterinary costs three to four times more expensive than other dogs, because any procedure or medication they receive is priced based on their weight. However, cost should never prevent us from providing our beloved pets with the best veterinary care possible. This is where pet insurance comes in.

Pro Tip: Pet insurance gives you peace of mind and allows you to provide your pup with the best veterinary treatment available by reimbursing covered veterinary costs. With less financial stress, you can focus on what’s really important: your Tibetan Mastiff’s health and happiness.

Key Takeaways

  • According to the American Kennel Club, male Tibetan Mastiffs should weigh between 90 and 150 pounds at maturity. Female Tibetan Mastiffs will weigh less, at around 70 to 120 pounds.
  • Tibetan Mastiffs are purebred dogs, which makes them more susceptible to certain diseases.
  • Preventative care is the best way to help your Tibetan Mastiff live a healthy and happy life.
  • Pet insurance provides you with a financial safety net so that you can make sure your puppy receives the best veterinary care.


  1. Pet Educate, "How Big Do Tibetan Mastiffs Get?" Accessed Aug. 23, 2021.
  2. American Kennel Club, “Official Standards of the Tibetan Mastiff” Accessed Aug. 23, 2021.
  3. Alpine Trail Vet Clinic, “Tibetan Mastiff Breed Information” Accessed Aug. 23, 2021.
  4. Veterinary Centers of America, “Mastiff Breed Information” Accessed Aug. 23, 2021.

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Dr. Lila Batiari, DVM

Dr. Lila Batiari
Small Animal Relief Veterinarian

Lila Batiari, DVM is a relief veterinarian located in San Diego, California. She has a special interest in nutrition, pain management, and surgery! Dr. Batiari enjoys working with Pawlicy Advisor to help others avoid everyday situations that some of her clientele experience. She realizes that expensive vet bills for treatment costs could be much easier for patients with pet insurance.

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