The Shih Tzu's flat face — a result of selective breeding for brachycephalic (shortened skull) anatomy — creates a cascade of practical feeding challenges that go beyond aesthetics. Because Shih Tzus cannot seal their lips tightly around kibble while chewing, they ingest significantly more air than normal-muzzled dogs. That swallowed air accumulates in the stomach, causing chronic gas, bloating, and in some cases gastric discomfort that owners mistake for food sensitivity. Studies of brachycephalic dogs consistently show higher rates of regurgitation, flatulence, and gastrointestinal discomfort compared to mesocephalic breeds — and kibble shape and feeding mechanics directly influence how much air is swallowed.
Shih Tzus are also one of the most commonly diagnosed breeds for chronic kidney disease in senior years. Research from the University of Georgia's Veterinary Medical Teaching Hospital found that Shih Tzus had higher kidney disease prevalence than many comparable toy breeds, thought to be linked to genetic predisposition and dietary factors over a lifetime. This does not require a prescription kidney diet in healthy dogs, but it does mean that phosphorus content, protein quality, and hydration — factors influenced heavily by food choice — matter from early adulthood.
This guide covers the four best Shih Tzu foods in 2026, the practical mechanics of feeding a flat-faced dog, the omega-3 and coat nutrition picture for a breed famous for its silky double coat, and what to avoid in a dog that is simultaneously prone to obesity, dental disease, and breathing difficulties that worsen with excess weight.
Why Shih Tzu Has Specific Needs
Shih Tzus are a brachycephalic breed, meaning the skull is shortened front-to-back, causing the nose, soft palate, and upper airway to be compressed into a smaller space. Brachycephalic Obstructive Airway Syndrome (BOAS) affects a significant proportion of the breed — a Cambridge University study of over 700 Shih Tzus found that 58.7% showed at least some degree of respiratory compromise. The practical feeding implication is that Shih Tzus cannot eat as efficiently as normal-muzzled dogs. They tilt their heads to grip kibble, breathe around food in their mouths, and swallow air in the process. Diets that require extended chewing, or that use large kibble the dog must angle to bite, worsen this pattern.
Weight management is critical not just for obesity-related reasons but for respiratory function. Every pound of excess fat in a brachycephalic dog narrows the already compressed airway further. The Shih Tzu's caloric needs are genuinely low — a typical adult at ideal weight (9–16 lbs, with most healthy adults around 10–12 lbs) needs only 280–380 kcal per day at a sedentary to moderate activity level. This is a breed that can easily gain weight on a "healthy" food if portions are not measured.
The Shih Tzu coat is a defining characteristic that requires nutritional support. The double coat — a soft undercoat and a long silky outer coat — is protein-dependent. Deficiencies in protein quality, omega-3 fatty acids (especially EPA and DHA), zinc, and biotin all manifest as dull, brittle, or thinning coat. Foods with salmon oil or fish meal provide the most bioavailable omega-3 source for coat quality. Biotin is often supplemented separately in show Shih Tzus, but it should be present in adequate amounts in a quality commercial food.
Dental disease in Shih Tzus follows the same pattern as other brachycephalic toy breeds — severe and early-onset due to tooth crowding in a compressed jaw. Shih Tzus have 42 adult teeth in a very short muzzle, resulting in significant crowding, rotation, and enamel contact that promotes plaque formation. Most Shih Tzus require professional dental cleaning by age 2–3. Food choices that minimize plaque accumulation, along with regular tooth brushing, are important preventive measures.
Our Top Picks
Royal Canin Shih Tzu Adult Dry Dog Food
The only food engineered specifically for the Shih Tzu's flat face — with a cross-shaped kibble that the dog can easily pick up regardless of muzzle angle, plus EPA and DHA for the breed's signature coat.
- ✓ Exclusive cross-shaped kibble geometry designed for the Shih Tzu's flat face — reduces head-tilting and air-gulping during eating
- ✓ EPA and DHA from fish oil plus biotin and omega-6 fatty acids to support the breed's double coat from the inside
- ✓ Controlled calorie density (~269 kcal/cup) appropriate for the breed's low daily energy needs and obesity tendency
Hill's Science Diet Small Breed Adult Chicken Meal & Rice Recipe
Phosphorus levels are controlled and protein quality is high in this AAFCO feeding-trial-backed formula — meaningful for a breed with documented kidney disease predisposition in senior years.
- ✓ Controlled phosphorus profile relevant to long-term kidney health in a breed with elevated CKD risk
- ✓ Natural glucosamine and chondroitin support joint health in a breed prone to luxating patellas
- ✓ Backed by AAFCO feeding trials — nutrient bioavailability verified rather than just label-calculated
Purina Pro Plan Small Breed Adult Sensitive Skin & Stomach Salmon & Rice Formula
Salmon as the first ingredient provides both the omega-3 fatty acids critical for Shih Tzu coat quality and a novel protein that is gentler on the breed's frequently sensitive GI system.
- ✓ Salmon first ingredient delivers EPA and DHA directly — the most bioavailable omega-3 source for coat and skin health
- ✓ Formulated for sensitive skin and stomachs — relevant to a breed prone to food-triggered skin reactions and GI issues
- ✓ Oat meal as the carbohydrate source provides gentle, prebiotic fiber appropriate for sensitive digestive systems
Blue Buffalo Life Protection Formula Small Breed Adult Chicken & Brown Rice Recipe
Deboned chicken first, small-breed kibble size, and the LifeSource Bits antioxidant blend make this a solid, accessible option for Shih Tzu owners who want quality ingredients without the premium breed-specific price.
- ✓ Deboned chicken as the first ingredient with added glucosamine (300 mg/kg) and chondroitin for joint support
- ✓ LifeSource Bits deliver a concentrated antioxidant blend that supports immune health and cellular maintenance
- ✓ No corn, wheat, or soy — reasonable for Shih Tzus with food sensitivities, without going full grain-free and the associated DCM concerns
What to Avoid
Round or irregularly shaped large kibble that forces head-tilting to eat: Shih Tzus cannot bite straight down on large, round kibble — they have to tilt their heads sideways to grip it, and this posture forces them to chew with their mouths partly open, swallowing additional air with every bite. Over the course of a meal, a Shih Tzu eating poorly shaped kibble can ingest enough air to cause significant gastric distension, belching, and discomfort. The Royal Canin Shih Tzu formula's cross-shaped kibble design directly solves this; other acceptable options are flat oval or disc-shaped kibble from small-breed formulas. Avoid any kibble labeled "medium" or "large breed" in a Shih Tzu's bowl. Additionally, any feeding situation that encourages competitive fast eating — eating too close to another dog, from a bowl that concentrates food into a pile — worsens air gulping in brachycephalic dogs. Slow-feeder bowls or puzzle feeders can help.
High-phosphorus diets in older Shih Tzus (7+): Once a Shih Tzu reaches senior age, phosphorus intake takes on additional importance. The kidneys filter dietary phosphorus, and in dogs with early chronic kidney disease (which can be subclinical for months before symptoms appear), high dietary phosphorus accelerates kidney function decline. Diets with phosphorus levels above 1.5% dry matter are worth avoiding in senior Shih Tzus — ask your vet about screening senior bloodwork (BUN, creatinine, SDMA) annually starting at age 7. A prescription renal diet is only needed after diagnosis; before that, choosing a quality food with moderate, not excessive, phosphorus is appropriate preventive management.
High-fat foods and fatty treats in overweight dogs: Shih Tzus are a sedentary breed that can become obese on otherwise reasonable amounts of food. Obesity in a brachycephalic dog is a respiratory emergency waiting to happen — fat deposits in the chest and abdomen further compress an already compromised airway, and obese Shih Tzus with BOAS have significantly worse breathing outcomes under general anesthesia (required for dental cleanings). Keep dietary fat at 14–18% dry matter for healthy adults, lower for any dog carrying excess weight.
How Much to Feed a Shih Tzu
A lightly active adult Shih Tzu at ideal weight (9–16 lbs, with the average healthy adult around 10–12 lbs) needs approximately 280–380 kcal per day. At a typical small-breed food density of 330–370 kcal per cup, that translates to roughly 0.75 to 1.1 cups per day, split into two meals. Because Shih Tzus are prone to obesity and the caloric margin is narrow, measuring food by weight (grams) rather than volume (cups) is more accurate — a kitchen scale and the food's kcal-per-gram value gives you exact portions in 30 seconds.
Puppies under 12 months need more calories per pound — roughly 35–40 kcal per pound of body weight daily, fed in three meals until 6 months, then twice daily after that. A 5 lb Shih Tzu puppy needs approximately 175–200 kcal per day — split into three meals of about 60–70 kcal each. Monitor weight monthly. At ideal weight, ribs should be easily palpable with light pressure and a waist visible from above. Shih Tzus can look heavier than they are due to their coat; always base body condition assessment on hands-on rib palpation rather than appearance from a distance.
Shih Tzu Coat Health: What Nutrition Actually Delivers
The Shih Tzu's long, silky double coat is protein and fatty-acid dependent. Hair is approximately 95% protein (keratin), so a food with inadequate protein quality or amino acid profile will show up first in coat quality — dullness, excessive shedding from the undercoat, brittleness, and slow regrowth after grooming. AAFCO minimum protein for adult maintenance is 18% dry matter, but Shih Tzu coat quality is better supported at 25–30% from high-quality animal sources.
Omega-3 fatty acids — specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) — are the most evidence-supported dietary factors for coat and skin quality. Both are found in fish oil, salmon meal, and marine-sourced ingredients. A meaningful daily intake of EPA (from food plus any supplement) reduces skin inflammation that contributes to seborrhea and coat thinning. DHA supports the lipid barrier of skin, reducing transepidermal water loss and improving coat texture and shine. If your Shih Tzu's coat is dull despite a quality food, adding a fish oil supplement is a reasonable first step — ask your vet what amount makes sense for your dog's size.
Zinc and biotin are co-factors in keratin synthesis. Zinc deficiency causes a characteristic scaly, flaky skin condition and poor coat quality — it is more common than owners realize, particularly in dogs on calcium-heavy diets where calcium competes with zinc absorption. B vitamins including biotin support keratin development. Most quality commercial foods provide adequate amounts, but they are worth checking if a Shih Tzu on a quality food still has poor coat quality despite adequate protein and omega-3 intake.
Feeding a Senior Shih Tzu: Kidney Health, Weight, and Transition Timing
Shih Tzus are considered senior at approximately 9–10 years of age, though this varies. The two most important nutritional shifts for senior Shih Tzus are caloric reduction (metabolism slows, often by 20–30%) and phosphorus management. A dog that was eating 1 cup per day at age 4 may need only 0.75 cups at age 10 to maintain the same weight — and if nothing changes, gradual weight gain over the senior years is nearly guaranteed.
Kidney health becomes the priority in senior Shih Tzus. Chronic kidney disease (CKD) is graded by IRIS (International Renal Interest Society) on a 1–4 scale. IRIS Stage 1 may be detectable only on bloodwork (SDMA elevation, mild creatinine change) with no symptoms. Annual bloodwork from age 7 onwards catches this early — and early detection matters because dietary phosphorus restriction in IRIS Stage 2 and above significantly slows disease progression. Your vet will determine if a prescription renal diet is needed; in the absence of a diagnosis, a senior small-breed food with moderate (not excessive) phosphorus and controlled protein is appropriate preventive management.
Transition to a senior formula when annual bloodwork or the vet recommends it, not necessarily at a specific age. Some Shih Tzus do well on adult food to age 11 or 12; others benefit from the transition earlier. The switch should follow the same gradual protocol as any food change — 10 days mixing old and new food in increasing ratios — to avoid GI upset in a breed with a sensitive digestive system.
Frequently Asked Questions
Why does my Shih Tzu eat so fast and burp constantly after meals?
This is a direct consequence of brachycephalic anatomy. Shih Tzus cannot close their mouths completely around kibble while chewing, so they take in air with every bite. Over the course of a meal, they can ingest significant amounts of gas that accumulates in the stomach and is then expelled as belching. Solutions include: slow-feeder bowls or puzzle feeders that force slower eating; breed-specific kibble shapes (like Royal Canin Shih Tzu) designed to be pickable without head-tilting; and elevated feeding bowls (2–4 inch elevation) which reduce the amount of head-angling required for some dogs. Persistent post-meal vomiting rather than just burping warrants a vet visit.
Is Royal Canin Shih Tzu food actually worth buying versus a generic small-breed food?
For this breed specifically, yes — the kibble shape is a genuine functional feature, not marketing. The cross-shaped design allows a flat-faced dog to pick up and break the kibble with less air ingestion than round or irregular pieces. The formula also contains EPA, DHA, and biotin at levels targeted for the Shih Tzu's double coat. If the price is a barrier, Hill's Science Diet Small Breed and Purina Pro Plan Small Breed Sensitive Skin & Stomach are good alternatives — the kibble shapes are less breed-optimized but the nutritional profiles are appropriate for Shih Tzus.
My Shih Tzu's coat is dull and dry despite eating a premium food. What's missing?
The most common culprits are insufficient omega-3 fatty acids (EPA and DHA), inadequate protein quality, or a zinc deficiency. First, check the food's ingredient list — fish oil, salmon meal, or herring should appear in the first 10 ingredients for meaningful omega-3 content. If they are absent or far down the list, add a fish oil supplement at approximately 20–40 mg EPA+DHA per pound of body weight per day. If you have been feeding the same food for more than 6 months with no coat improvement, discuss with your vet — zinc deficiency and other underlying causes can be assessed with bloodwork.
How do I know if my Shih Tzu is overweight?
Do not rely on appearance — Shih Tzus in full coat can look heavier than they are, and underweight dogs with thick coats can appear normal. Instead, run your hands along the rib cage with light pressure: you should be able to feel each rib distinctly without pressing hard. If you have to press firmly or cannot feel ribs at all, the dog is overweight. Viewed from above with coat parted, there should be a subtle waist definition behind the rib cage. Weigh monthly — a 0.5 lb gain in a 10 lb dog is a 5% weight increase and worth addressing immediately by reducing daily food by 10%.
When should I switch my Shih Tzu to a senior food?
There is no single right age, but most veterinarians recommend starting annual senior bloodwork (including kidney markers SDMA, BUN, and creatinine) at age 7–8. If kidney values are normal and body weight is stable, your vet may recommend staying on an adult food. If weight has been creeping up, a lower-calorie senior formula is worth considering from age 9 onwards. If any kidney markers are elevated — even mildly — discuss phosphorus-restricted options immediately, as early dietary phosphorus management is the single most effective nutritional intervention for slowing CKD progression in dogs.