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We all want as many years with our shih tzus as possible. As your Shih Tzu ages, you may be looking for additional ways to support their health.

The following list of supplements is among the top recommended products for senior Shih Tzus. As always, be sure to consult your own veterinarian before making any changes to your Shih Tzu’s dietary or medical regimen.

1. Glucosamine & Chondroitin for Supporting Your Senior Shih Tzu’s Aging Joints

Joint pain and arthritis are some of the most common ailments an aging shih tzu will face. Supplements containing glucosamine aid in replacing lost joint fluid, providing much-needed lubrication and cushioning to stiff, achy joints. Chondroitin sulfate has been shown to improve the structural integrity of joints by repairing damaged cartilage and preventing further cartilage breakdown.

You can learn more about the glucosamine and chondroitin supplement iHeartDogs recommends here.

2. Probiotics for Immune & Gut Support for Your Senior Shih Tzu

Probiotics are supplements containing large doses of microorganisms. They promote a healthy GI tract by allowing the “good” bacteria in the gut to flourish. “Bad” bacteria often accumulate due to stress, illness, and long-term medication use. Since the majority of your senior dog’s immune system is located in the gut, probiotics also help to maintain health throughout the body.

We’d recommend looking into a 3-in-1 probiotic that also contains prebiotics and digestive enzymes. 

3. Omega-3 Essential Fatty Acids to Fight Inflammation & Reduce Itchy Skin for Your Senior Shih Tzu

Older dogs may experience dry, itchy skin and dull, brittle coats. Adding Omega-3 and Omega-6 fatty acids to a senior dog’s diet can reduce inflammation and promote healthy skin and a soft, shiny coat. Omega-3 fatty acids also support healthy mobility and bone health. Additional benefits in the body include allergy support, heart health, strong brain function, and visual acuity.

Krill oil is one of the best sources of Omega-3 available, as it contains a special form of fatty acids that are more usable in your dog’s body. In addition, many high-quality krill supplements also contain a powerful compound called astaxanthin, an extremely potent antioxidant.

4. Milk Thistle for Your Shih Tzu’s Liver & Kidney Support, Especially for Dogs Taking Pain Meds

Natural milk thistle is said to protect the liver from damage and may actually improve liver function. This is important for aging shih tzus, especially those with existing liver problems and those taking medications known to be taxing on the liver. For example, any dog regularly taking an NSAID pain medication such as carprofen, Novox, Rimadyl, deracoxib, Deramaxx, firocoxib, Previcox, meloxicam, Metacam, grapipant, or Galliprant may need additional liver support. Make sure to discuss this with your vet.

5. Curcumin (from Turmeric) for Pain & Inflammation

This “wonder spice” is a derivative of turmeric and promotes brain and joint health in aging shih tzus. Some studies have suggested that turmeric can provide nearly the same pain relief as an NSAID drug. Lastly, curcumin is also known for its possible anti-tumor properties and in helping to support dental health.

Many high-quality hip and joint supplements, such as this one, contain turmeric in the formula.

6. Hemp Oil for Your Senior Shih Tzu’s Pain & Inflammation

No discussion of senior dog supplements would be complete without discussing Hemp. In the last 5 years, several studies have begun to show great promise for Hemp in helping to alleviate joint pain, calm a nervous dog, reduce inflammation caused by allergies, and reduce seizures in epileptic pups.

We’d recommend a Hemp oil or Hemp chew that contains 0% THC, as well as using a product that is tested multiple times throughout the manufacturing process to ensure a pure and potent product. Here at iHeartDogs, we only sell and recommend the Cannanine brand.

7. Fiber for Your Senior Shih Tzu’s Digestive Health

Senior dogs may experience changes in the lining of the intestines, which lowers their ability to digest and absorb the nutrients in their food. Adding healthy fiber to your older pup’s diet supports a healthy digestive system, combats constipation, and promotes overall health.

8. Extra-Protein for General Shih Tzu Aging Support

As your shih tzu’s body ages, it breaks down muscle and tissues at a faster rate than before. For this reason, aging dogs need extra protein in their diet (note: there are some exceptions, such as if your senior dog has chronic kidney disease, in which your vet may recommend a lower protein diet).

Many senior shih tzu parents opt to add additional protein to their dog’s kibble, such as a cooked or raw egg, chicken breast, or a freeze-dried dog food topper. Surprisingly, most kibbles only contain around 20-30% protein, so boosting this vital nutrient can be very helpful for seniors. It can also substantially help their appetite!

9. Dog-Safe Mushrooms such as Shiitake, Turkey Tail, & Reishi for Immune Boosting Support

Mushrooms are an incredibly exciting area of emerging nutritional studies. Some clinical trials have shown great promise in extending the lifespan of dogs battling cancer. And while it’s not a miracle, mushrooms like Reishi, Turkey Tail, and Shiitake can undoubtedly boost the immune system of your Shih Tzu.

As you are probably aware, many mushrooms can be toxic to dogs, especially those found in your yard. Make sure to use a dog-safe mushroom supplement if you choose to give one to Fido. This particular formula contains 6 different mushrooms, as well as organic chicken bone broth. 

10. Collagen-rich bone Broth, which supports healthy joints and skin in seniors

One of the biggest causes of early death in shih tzus is reduced mobility. Bone broth is packed with joint-supporting nutrients like glucosamine, chondroitin, and collagen, all of which help keep your older pup mobile longer. In addition, most senior dogs LOVE the flavor, and it will boost the nutrition and taste of their current food.

The product iHeartDogs recommends and sells contains both bone broth and 6 different immune-supporting mushrooms.

Frequently Asked Questions: Best Supplements for a Senior Shih Tzu

1. What supplements are most important for a senior Shih Tzu?

Senior Shih Tzus often benefit from supplements that support joint health, coat and skin, digestive health, and immunity. Popular choices include glucosamine, omega-3 fatty acids, probiotics, and multivitamins.

2. Why does my senior Shih Tzu need supplements?

As dogs age, their natural production of joint lubricants, digestive enzymes, and immune defenses slows down. Supplements help fill these gaps, keeping your Shih Tzu active, comfortable, and healthy.

3. Is glucosamine safe for older Shih Tzus?

Yes. Glucosamine is commonly used to reduce stiffness, support cartilage health, and improve mobility in senior dogs. Always follow the vet-recommended dosage.

4. What are the best joint supplements for a senior Shih Tzu?

Glucosamine, chondroitin, MSM (methylsulfonylmethane), and green-lipped mussel are excellent joint-supporting ingredients for Shih Tzus experiencing arthritis or hip issues.

5. Should I give my senior Shih Tzu probiotics?

Yes. Probiotics help regulate digestion, reduce bloating, and improve nutrient absorption, which is especially helpful for older dogs with sensitive stomachs.

6. Can omega-3 fatty acids help my senior Shih Tzu?

Definitely. Omega-3s from fish oil support joint health, reduce inflammation, improve heart health, and keep the skin and coat shiny.

7. Do senior Shih Tzus need multivitamins?

Yes, multivitamins can be very beneficial. They ensure your Shih Tzu gets essential nutrients that may be missing from their diet, especially if they’re picky eaters.

8. Are there supplements to help with my Shih Tzu’s heart health?

Yes. Taurine, CoQ10, and omega-3 fatty acids are often recommended for small breeds like Shih Tzus to support heart function in their senior years.

9. Can supplements help with my Shih Tzu’s dental health?

Some dental chews and supplements with enzymes or probiotics can reduce plaque buildup and improve oral hygiene, which is crucial for senior Shih Tzus.

10. What supplements support my Shih Tzu’s immune system?

Antioxidants like vitamins C and E, probiotics, and omega-3 fatty acids strengthen the immune system, helping your senior dog fight off infections and age-related issues.

11. Are there natural supplements for senior Shih Tzus?

Yes. Ingredients like turmeric (for inflammation), pumpkin (for digestion), and coconut oil (for skin and coat) are natural options that many Shih Tzu owners use.

12. How do I choose the right supplement for my senior Shih Tzu?

Look for supplements with high-quality, vet-approved ingredients. Avoid fillers, artificial additives, or unnecessary ingredients. Consulting your vet before starting is always best.

13. How long does it take for supplements to work in a Shih Tzu?

It varies by supplement, but most owners notice improvements in joint mobility, coat quality, or digestion within 4–6 weeks of consistent use.

14. Can I give my Shih Tzu human supplements?

No. Human supplements may contain unsafe dosages or harmful ingredients for dogs. Always use pet-specific formulas designed for small breeds like Shih Tzus.

15. Should I consult my vet before giving supplements?

Absolutely. While many supplements are safe, your vet can recommend the correct dosage and ensure they won’t interfere with existing medications or health conditions.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The information on this website is not intended to replace a one-on-one relationship with a qualified healthcare professional.

Related: Top Pet Insurance Plans for Shih Tzus

Choosing the Best Supplements for a Senior Shih Tzu

As Shih Tzus age, their nutritional needs change, making the right supplements an essential part of their daily care. From joint support to digestive health and immune-boosting formulas, high-quality supplements can help keep your senior Shih Tzu active, comfortable, and happy. Always consult your veterinarian before adding new supplements to ensure they match your dog’s specific health needs. By choosing the best senior dog supplements, you’ll support your Shih Tzu’s overall well-being and give them the healthy, happy golden years they deserve.

iHeartDogs is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no extra cost to you.