The Shih Tzu is widely adored for its compact size, elegant coat, and affectionate personality. But what happens when this famously small breed surprises us with unexpected growth? That’s the case with the biggest Shih Tzu ever recorded—a rare dog that completely redefines expectations for this toy breed. While most Shih Tzus fall within the standard 9–16 pounds weight range, there are exceptions that leave both dog lovers and veterinarians amazed.
Let’s explore the story, facts, and care essentials behind these giant-sized Shih Tzus—and understand what makes them stand out, both in size and charm.
What Is the Biggest Shih Tzu?
The term “biggest Shih Tzu” doesn’t refer to a distinct breed or officially recognized classification. Rather, it describes exceptionally large individuals that exceed the breed’s standard size guidelines set by organizations like the American Kennel Club (AKC). These dogs often weigh between 20 to 40+ pounds, doubling or even tripling the usual weight range.
One of the most famous examples is Stanley, a Shih Tzu that reached an astonishing 40+ pounds and captured attention through photos shared on Flickr. Another well-known case is Troy, who weighs around 25 pounds and became a viral sensation on Reddit. These dogs, while rare, are purebred Shih Tzus—just much larger than expected.
Breed Standards vs. Outliers
According to the AKC, a standard Shih Tzu should weigh between 9 and 16 pounds and stand 8 to 11 inches tall at the shoulder. The breed is categorized under “toy” due to its dainty stature. But in the case of giant Shih Tzus, these measurements are significantly exceeded. Some may weigh as much as three times the breed norm, while maintaining the classic Shih Tzu features: a round face, flowing double coat, and warm expression.
What’s especially interesting is that these oversized Shih Tzus retain the breed’s temperament—they’re still gentle, loving, and eager to please. It’s just their size that sets them apart.
What Causes a Shih Tzu to Grow So Big?
Size in dogs is primarily determined by genetics, but other factors can influence growth. In the case of a giant Shih Tzu, the most common reasons include:
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Genetic Anomalies: Occasionally, a Shih Tzu may inherit genes that promote larger body mass, longer limbs, or a broader frame.
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Overfeeding During Growth: Puppies fed excessive calories early on may develop larger bones and increased fat deposits.
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Early Neutering: Spaying or neutering before growth plates close may result in slightly taller or broader dogs.
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Underlying Health Issues: Hypothyroidism and other metabolic disorders can lead to abnormal weight gain.
Despite their size, not all big Shih Tzus are overweight. Some genuinely have a large-boned structure, which is rare but naturally occurring.
Benefits of a Bigger Shih Tzu
Though larger Shih Tzus aren’t ideal for the show ring, they bring several unique advantages to family life. First, their sturdier build makes them better suited for families with children. While a standard Shih Tzu might be fragile around toddlers, a heavier one can handle playtime without risk of injury.
They also tend to have more stamina, enjoying longer walks and outdoor time without tiring quickly. Owners often find them to be more robust, energetic, and interactive, while still retaining the breed’s sweet and social demeanor.
Their unusual size also draws attention and curiosity, making them a favorite in parks and online pet communities. For pet lovers who enjoy something a little different, a big Shih Tzu is a conversation starter.
Famous Giant Shih Tzus Online
Stanley, often called the world’s largest Shih Tzu, rose to fame through a Flickr album showcasing his adventures. His massive size, reportedly over 40 pounds, shocked viewers but also highlighted the diversity within the breed.
Troy, another well-known big Shih Tzu, gained popularity on Reddit where users jokingly referred to him as part bear due to his large frame. Weighing about 25 pounds, Troy remains healthy and playful according to his owner.
Then there’s Gizmo, who lives in New York and is lovingly dubbed The World’s Largest Tzu by his Instagram followers. At 20+ pounds, Gizmo showcases fashion, urban lifestyle, and big dog charm—all in one fluffy package.
Is This Size Healthy?
Not always. That’s why it’s important to distinguish between a naturally large Shih Tzu and one that’s simply overweight. A healthy large Shih Tzu has a defined waist, no excessive fat rolls, and moves comfortably. On the other hand, a dog carrying too much fat may suffer from:
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Joint pain and arthritis
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Heart strain
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Difficulty breathing, especially common in brachycephalic breeds like the Shih Tzu
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Reduced lifespan
Regular check-ups with a veterinarian can help determine whether a Shih Tzu’s size is healthy or cause for concern. If a dog is genuinely oversized by nature, it’s important to tailor its diet and exercise plan accordingly.
How to Care for a Big Shih Tzu
Caring for a large Shih Tzu is similar to caring for a standard one, but there are a few specific adjustments to make:
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Controlled Feeding: Avoid free-feeding. Measure food portions and offer only low-fat, high-fiber meals.
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Regular Exercise: Walks should be consistent but not too long. Daily playtime is essential.
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Joint Supplements: Glucosamine and omega-3 fatty acids help support healthy joints.
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Weight Monitoring: Keep a growth chart or track weight monthly to prevent obesity.
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Professional Grooming: Their long coat grows just like standard Shih Tzus and needs brushing, bathing, and trimming regularly.
Big Shih Tzus may also benefit from orthopedic beds, ramps for furniture, and stairs to help them get into cars or onto couches.
Recognition in the Dog World
Despite their popularity online, giant Shih Tzus are not recognized by kennel clubs for competition. The AKC, The Kennel Club (UK), and FCI (Fédération Cynologique Internationale) all maintain strict standards for height and weight in the breed.
However, this doesn’t make oversized Shih Tzus any less lovable or worthy of attention. While they’re excluded from conformation shows, they still thrive in family environments, social media fame, and even therapy roles.
Should You Adopt a Large Shih Tzu?
If you’re considering adopting a Shih Tzu and end up with a large one, don’t worry—they can be just as healthy and happy as their smaller counterparts. In fact, their larger frame may offer increased physical stability, better interaction with kids, and more resistance to injury.
However, it’s essential to ask yourself:
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Are you willing to manage their weight closely?
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Can you afford extra food, grooming, and health supplements?
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Do you have space for a slightly larger dog in your home or apartment?
If the answer is yes, then a big Shih Tzu may be the perfect unique addition to your life.
Understanding Their Personality
One thing that doesn’t change with size is the Shih Tzu’s personality. Whether small or oversized, they remain:
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Affectionate and loyal
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Gentle with kids and seniors
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Alert but not aggressive
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Sociable and expressive
Their large size doesn’t affect the warm, charming behavior that makes the breed so beloved worldwide.
Conclusion
The biggest Shih Tzu ever recorded may defy standard definitions, but that’s exactly what makes it so fascinating. Whether it’s Stanley with his 40+ pound frame or Troy delighting Reddit users, these large versions of a small dog breed remind us that nature always has surprises.
Owning a big Shih Tzu requires responsibility, attention to health, and genuine affection—but in return, you’ll receive a companion that’s just as gentle, loving, and loyal as any toy-sized Shih Tzu.
Sometimes, love truly does come in extra-large packages.
Discover the rare world of giant Shih Tzus—read now!
