Shih Tzu and King Charles Spaniel Mix: Complete Breed Guide

If you've been researching small companion dogs, you may have come across the Shih Tzu and King Charles Spaniel mix — sometimes called the King Shih or Shih Charles. This designer cross combines two toy breeds with centuries of royal companionship behind them. But unlike purebred dogs with predictable breed standards, mixed-breed dogs are genetic roll-of-the-dice propositions. What you get might lean heavily toward one parent or land somewhere entirely unexpected.

This guide breaks down everything you need to know before bringing one of these dogs home — from coat genetics and size variability to the real health risks they inherit from both parent breeds. No sugarcoating, no hype.

The Parent Breeds: What Goes Into This Mix

Understanding a designer dog starts with understanding its parents. Both the Shih Tzu and the Cavalier King Charles Spaniel are toy-breed companions, but they differ in meaningful ways that affect what their offspring might look and act like.

Parent Breed Comparison

Trait	Shih Tzu	Cavalier King Charles Spaniel
Origin	China (imperial palace dog)	United Kingdom (royal lap dog)
AKC Group	Toy	Toy
Weight Range	9–16 lb (4–7 kg)	13–18 lb (6–8 kg)
Height	9–10.5 in (23–27 cm)	12–13 in (30–33 cm)
Coat Type	Long, flowing double coat; hair-like texture	Moderate-length silky coat with feathering
Shedding Level	Low (hair, not fur)	Moderate (true fur, seasonal shedding)
Head Shape	Brachycephalic (very short muzzle)	Moderately brachycephalic
Energy Level	Low to moderate	Low to moderate
Lifespan	10–18 years	12–15 years
Common Health Issues	BOAS, eye conditions, hip dysplasia	Mitral valve disease, syringomyelia, hip dysplasia

The Shih Tzu was bred as a palace companion in imperial China — alert, affectionate, and sometimes stubbornly independent. The Cavalier King Charles Spaniel descends from English toy spaniels favored by royalty and was specifically re-created in the 20th century to have a longer muzzle than its cousin, the English Toy Spaniel. Both breeds prioritize human companionship above all else.

Generations Explained: F1, F1B, and Beyond

Most Shih Tzu and King Charles Spaniel mixes you'll encounter are F1 crosses. Breeders producing F1B or multigen litters are relatively rare for this particular pairing — unlike Goldendoodles or Labradoodles, this mix hasn't developed a large-scale breeding infrastructure. If a breeder claims multigen King Shihs, ask to see documentation of at least three generations of intentional pairing.

Size, Appearance, and the Variability Factor

Here's where prospective owners need to manage expectations. Unlike a purebred dog that falls within a tight size window, this mix can vary significantly — even between littermates.

Expected Size Range for Shih Tzu × Cavalier Mix

Measurement	Minimum	Maximum	Most Common
Weight (adult)	8 lb (3.6 kg)	18 lb (8.2 kg)	11–15 lb (5–7 kg)
Height at shoulder	9 in (23 cm)	13 in (33 cm)	10–12 in (25–30 cm)

The dog's ultimate size depends on which parent they genetically favor. An F1 puppy who inherits the Shih Tzu's compact bone structure will land on the smaller end, while one who takes after the Cavalier's slightly longer frame will be noticeably larger. F1B puppies backcrossed to a Shih Tzu tend to run smaller.

Coat Types, Shedding, and the Hypoallergenic Question

Let's address the most common question directly: No, the Shih Tzu and King Charles Spaniel mix is not reliably hypoallergenic. Anyone telling you otherwise is either misinformed or selling something.

Here's why. The Shih Tzu has a hair-like coat that sheds minimally and is often tolerated better by allergy sufferers. The Cavalier King Charles Spaniel has a true fur coat with moderate year-round shedding and heavier seasonal blows. When you cross them, puppies can inherit:

• Shih Tzu-dominant coat: Long, single-layer, hair-like texture. Low shedding. Requires daily brushing and professional grooming every 6–8 weeks. Closest to "hypoallergenic" but still produces dander.
• Cavalier-dominant coat: Silky, moderate length with feathering on ears, legs, and tail. Moderate shedding. Brushing 3–4 times per week. No professional grooming required but trimming helps.
• Blended coat: Wavy or slightly curly texture with moderate length. Moderate shedding with some matting tendency. Brushing 4–5 times per week with professional trims every 8–10 weeks.

You typically cannot predict which coat type a puppy will develop until they're 4–6 months old and their adult coat starts coming in. If low shedding is a non-negotiable requirement for your household, this mix carries real risk of disappointment.

Coat colors are equally variable. Expect any combination of: black and tan (Cavalier-influenced), Blenheim (chestnut and white), gold, white, liver, brindle, or tricolor. The Shih Tzu carries genes for nearly every color in the canine spectrum, and the Cavalier adds its four recognized patterns. The result is essentially a color lottery.

Temperament: Best Case, Worst Case, and Reality

Both parent breeds were developed exclusively as companion dogs — neither has working, herding, or hunting drives to manage. This makes the Shih Tzu and King Charles Spaniel mix one of the more temperamentally straightforward designer crosses. But "straightforward" doesn't mean "without challenges."

Best-Case Scenario

You get a dog that is deeply affectionate, gentle with children and other pets, adaptable to apartment living, moderately playful without being hyperactive, and eager to please during training sessions. They follow you from room to room, curl up on your lap every evening, and greet visitors with a wagging tail rather than alarm barking. This is the most common outcome given both breeds' strong companion-dog selection.

Challenging Scenarios

The Shih Tzu side can contribute stubbornness and a streak of independence that makes training feel like a negotiation. Housebreaking may take 4–6 months of consistent crate training and scheduled outings — Shih Tzus are notoriously slow to house-train compared to other toy breeds. Some individuals develop separation anxiety, vocalizing or engaging in destructive behavior when left alone for more than 3–4 hours.

The Cavalier side can contribute a strong prey drive toward small animals (despite being a toy breed, spaniels retain bird-dog instincts) and a tendency to follow scents with their nose down, ignoring recall commands. Off-leash reliability requires dedicated training regardless of how sweet the dog seems in the house.

Socialization Priorities

Between 8 and 16 weeks of age, focus on:

1. Handling exercises — touching paws, ears, mouth, and tail daily to prepare for grooming and veterinary exams
2. Meeting 50+ different people across ages, sizes, and appearances
3. Positive exposure to sounds (vacuum, doorbell, thunderstorms via recordings at low volume)
4. Supervised interactions with vaccinated, friendly dogs of various sizes
5. Short car rides to non-vet destinations to prevent car anxiety

Use only positive reinforcement methods — treats, praise, and play. Force-free training builds confidence in small dogs, while aversive methods (shock collars, prong collars, alpha rolls) can create fear-based reactivity that's especially dangerous in a dog under 15 pounds.

Health Considerations: The Hybrid Vigor Myth vs. Reality

Let's be direct: hybrid vigor does not eliminate health risks in designer dogs. The concept of heterosis — where crossbred animals show improved biological function — applies primarily to traits controlled by many genes (like fertility and general hardiness). It does not erase the risk of inheriting specific genetic diseases that both parent breeds share.

According to the Merck Veterinary Manual, the following conditions pose real risks for this mix because they appear in both parent breeds or are severe enough in one parent to warrant concern:

Health Conditions to Screen For

Condition	Parent Breed Risk	What to Watch For	Screening Recommendation
Mitral Valve Disease (MVD)	Cavalier (extremely high — over 50% affected by age 5)	Heart murmur, coughing, exercise intolerance, rapid breathing at rest	Annual cardiac exam starting at age 2; echocardiogram if murmur detected
Brachycephalic Obstructive Airway Syndrome (BOAS)	Shih Tzu (high), Cavalier (moderate)	Snoring, noisy breathing, exercise intolerance, heat sensitivity, gagging	Veterinary airway assessment; avoid breeding dogs with severe BOAS
Syringomyelia (SM)	Cavalier (high prevalence)	Neck scratching without making contact, yelping in pain, sensitivity to touch near head/neck	MRI screening if symptoms appear; no routine screening available for asymptomatic dogs
Patellar Luxation	Both breeds (moderate)	Occasional skipping or hopping on hind legs, knee "popping" out of place	Orthopedic exam at 12–18 months; OFA patella evaluation
Hip Dysplasia	Both breeds (moderate for toy breeds)	Difficulty rising, bunny-hopping gait, reluctance to jump or climb stairs	OFA or PennHIP evaluation at 24 months
Eye Conditions (PRA, cataracts, dry eye)	Both breeds	Cloudy eyes, bumping into furniture, excessive tearing or dry/discharge-prone eyes	Annual CERF/OFA ophthalmologist exam
Intervertebral Disc Disease (IVDD)	Both breeds (moderate)	Back pain, reluctance to move, dragging hind legs, sudden paralysis	Clinical monitoring; no predictive screening available

A responsible breeder of this mix should provide health clearances for both parent dogs — not just the claim that they "look healthy." For the Cavalier parent, request a cardiac clearance from a veterinary cardiologist (not just a general practitioner listening for murmurs). For the Shih Tzu parent, request OFA eye and patella clearances. Expect to pay more for puppies from health-tested parents, but the investment reduces your risk of devastating diagnoses in the dog's first five years.

Always consult your veterinarian about an appropriate screening schedule for your individual dog based on their specific build, muzzle length, and family history.

Grooming, Exercise, and Daily Care Requirements

Grooming by Coat Type

Your grooming commitment depends entirely on which coat your dog inherits:

Coat Type	Brushing Frequency	Professional Grooming	Estimated Annual Cost
Shih Tzu-dominant (long hair)	Daily, 10–15 minutes	Every 6–8 weeks ($50–$85 per session)	$400–$750
Cavalier-dominant (silky fur)	3–4 times per week, 5–10 minutes	Optional; sanitary trims every 10–12 weeks ($35–$55)	$150–$300
Blended/wavy coat	4–5 times per week, 10 minutes	Every 8–10 weeks ($45–$75)	$300–$550

Regardless of coat type, both parent breeds require regular attention to:

• Eyes: Brachycephalic-influenced eyes are prone to tear staining and irritation. Wipe the eye area daily with a damp, lint-free cloth. If your dog inherits a very short muzzle, check for eyelashes or hair rubbing against the cornea (entropion/trichiasis).
• Ears: Drop ears trap moisture and debris. Clean weekly with a veterinarian-recommended ear cleanser. Watch for redness, odor, or head-shaking that signals infection.
• Teeth: Toy breeds are highly prone to periodontal disease. Brush teeth daily with enzymatic dog toothpaste. Plan for professional dental cleanings under anesthesia starting at age 2–3, typically every 1–2 years thereafter ($400–$900 per cleaning).
• Nails: Trim every 2–3 weeks. Overgrown nails alter foot mechanics and can contribute to patellar luxation discomfort.

Exercise Needs

This mix typically requires 30–45 minutes of daily activity, split into two walks plus indoor play. They are not endurance dogs — especially if they inherit a shorter muzzle, which limits heat tolerance and breathing capacity.

Practical exercise guidelines:

• Two leash walks of 15–20 minutes each, avoiding midday heat in summer
• Indoor play sessions with puzzle toys, tug, or short fetch down a hallway
• Temperature cutoff: avoid outdoor exercise above 80°F (27°C) for dogs with shorter muzzles
• Use a harness rather than a collar — both parent breeds have tracheal sensitivity, and collar pressure can worsen airway issues

Cost Breakdown: Purchase Price and Lifetime Expenses

The Shih Tzu and King Charles Spaniel mix occupies a mid-range price point among designer toy breeds. Here's what to budget:

Expense Category	Low End	Typical Range	High End
Puppy purchase (from breeder)	$800	$1,200–$2,500	$3,500+
Adoption/rescue fee	$200	$300–$500	$600
First-year veterinary care (vaccines, spay/neuter, microchip)	$500	$800–$1,200	$1,500
Annual ongoing veterinary care	$400	$600–$1,000	$1,500+
Food (quality small-breed formula)	$240/year	$360–$480/year	$600/year
Grooming (varies by coat type)	$150/year	$300–$550/year	$750/year
Pet insurance (monthly premium)	$30/month	$40–$60/month	$80/month
First-year total (puppy + supplies + care)	$2,200	$3,500–$5,500	$7,000+

Pet insurance is particularly worth considering for this mix. Cavalier King Charles Spaniels have some of the highest lifetime veterinary costs among toy breeds due to mitral valve disease treatment, and a King Shih that inherits this predisposition could need cardiac medications for years. Companies like Trupanion, Healthy Paws, and Nationwide cover hereditary conditions when enrolled before diagnosis — ideally at 8–10 weeks of age.

Finding a King Shih: Breeders vs. Rescue

This mix is uncommon enough that you won't find them at every breeder or rescue. To locate one:

• Breeders: Search for small-breed designer dog breeders who openly share health testing results for both parent dogs. Expect waitlists of 2–6 months. Red flags include breeders who can't name the specific health tests performed, who always have puppies available, or who sell through pet stores.
• Rescue: Check Cavalier-specific rescues (such as Cavalier Rescue USA) and Shih Tzu rescues — both organizations occasionally take in mixed-breed dogs that match their breed profile. Petfinder and Adopt-a-Pet allow you to search by breed mix. Adoption fees are significantly lower and typically include spay/neuter, vaccinations, and a veterinary exam.

Who This Mix Suits Best

The Shih Tzu and King Charles Spaniel mix is a strong fit for:

• Apartment dwellers: Their small size and moderate energy make them excellent apartment dogs. They don't need a yard, though access to a nearby park for sniffing walks keeps them mentally stimulated.
• Work-from-home households: Both parent breeds are prone to separation anxiety. This mix thrives with someone home most of the day or with arrangements for midday visits.
• Families with gentle, older children: These dogs are affectionate with kids but too small and physically delicate for roughhousing. Best with children ages 8+ who understand how to handle a small dog respectfully.
• First-time dog owners: The companion temperament is forgiving of training mistakes, and the exercise requirements are manageable. However, first-time owners should budget for a puppy training class ($150–$250 for a 6-week group course) to establish good habits early.
• Senior owners: The low exercise demands and lap-dog nature make this mix well-suited to retirees, provided they can manage the grooming requirements and afford potential veterinary costs.

This mix is not ideal for:

• Households where the dog will be crated or left alone for 8+ hours daily
• Families seeking an outdoor adventure dog — this is not a hiking or jogging companion
• Households with very young children who may accidentally injure a small dog
• Anyone seeking a guaranteed hypoallergenic dog

Frequently Asked Questions

What two breeds make up the Shih Tzu and King Charles Spaniel mix?

This designer cross is a combination of the Shih Tzu (an ancient Chinese companion breed) and the Cavalier King Charles Spaniel (a British toy spaniel). Both are AKC-recognized toy breeds bred exclusively for companionship.

How big will this mixed breed get?

Most adults weigh between 11 and 15 pounds (5–7 kg) and stand 10 to 12 inches (25–30 cm) at the shoulder. However, the full possible range is 8 to 18 pounds (3.6–8.2 kg) depending on which parent's size genes dominate.

What will the temperament be like?

Expect an affectionate, people-oriented companion dog. The most common temperament is gentle, playful in short bursts, and deeply bonded to their family. Some individuals inherit Shih Tzu stubbornness that requires patience during training, while others lean toward the Cavalier's eager-to-please nature.

Is this mix hypoallergenic or low-shedding?

Not reliably. Only puppies who inherit the Shih Tzu's hair-like coat will be low-shedding. Those who inherit the Cavalier's fur coat will shed moderately. You cannot predict coat type at 8 weeks — it becomes apparent around 4–6 months. No dog is truly hypoallergenic, as allergens come from dander and saliva, not just hair.

What health issues might this mix inherit?

The most significant concern is mitral valve disease from the Cavalier side — over 50% of Cavaliers develop MVD by age five. Other risks include brachycephalic airway syndrome, patellar luxation, syringomyelia, eye conditions, and IVDD. Health testing of both parent dogs significantly reduces (but does not eliminate) these risks.

How much does this designer mix cost?

Puppies from breeders typically range from $1,200 to $2,500, with health-tested parent lines commanding $2,500 to $3,500+. Adoption through breed-specific rescues costs $200 to $600. First-year total expenses (puppy, supplies, veterinary care, grooming) typically fall between $3,500 and $5,500.

How long do Shih Tzu and King Charles Spaniel mixes live?

With proper veterinary care, most live 12 to 15 years. Some reach 16 or 17, particularly those who avoid early-onset mitral valve disease and maintain a lean body condition score throughout life.

Are they easy to train?

Moderately easy. The Cavalier influence tends to produce a willing learner, but the Shih Tzu side can add stubbornness, especially for housebreaking. Keep training sessions short (5–10 minutes), use high-value treats, and stay consistent. Expect housebreaking to take 3–6 months with a structured schedule.