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We all want as many years with our cavaliers as possible. As your cavalier 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 cavaliers. As always, be sure to consult your own veterinarian before making any changes to your cavalier’s dietary or medical regimen.

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

Joint pain and arthritis are some of the most common ailments an aging cavalier 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 Cavalier

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 prolonged use of medications. 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 Cavalier

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 Cavalier’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 cavaliers, 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, deracoxi, 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 cavaliers. 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,s contain turmeric in the formula.

6. Hemp Oil for Your Senior Cavalier’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 nervous dogs, 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 Cavalier’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 Cavalier Aging Support

As your cavalier’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 cavalier 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 cavalier.

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 cavaliers 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 Cavalier

1. What supplements do senior Cavalier King Charles Spaniels need most?

Senior Cavaliers often benefit from joint support supplements (glucosamine, chondroitin, MSM), omega-3 fatty acids for heart and skin health, probiotics for digestion, and antioxidants to support immunity and brain health.

2. Why are supplements important for older Cavaliers?

As Cavaliers age, they are prone to heart disease, joint problems, and digestive issues. Supplements can help manage these conditions, improve quality of life, and support overall longevity.

3. Are joint supplements necessary for senior Cavaliers?

Yes, joint supplements with glucosamine, chondroitin, and MSM can ease stiffness, reduce inflammation, and keep older Cavaliers more mobile and comfortable.

4. Can omega-3 supplements help with my Cavalier’s heart health?

Absolutely. Cavaliers are prone to mitral valve disease, and omega-3 fatty acids from fish oil can support heart function, reduce inflammation, and improve circulation.

5. What digestive supplements are good for senior Cavaliers?

Probiotics and digestive enzymes are highly beneficial. They help maintain a healthy gut, reduce bloating or diarrhea, and ensure your senior Cavalier absorbs nutrients properly.

6. Do Cavaliers need multivitamins as they age?

Yes, multivitamins can fill nutritional gaps in your Cavalier’s diet, especially if they’re picky eaters or on a limited diet due to health issues.

7. Which supplements help with cognitive decline in older Cavaliers?

Antioxidants like vitamin E, vitamin C, and CoQ10, along with omega-3s, can support brain health and may help slow age-related cognitive decline.

8. Are supplements safe to give with prescription medications?

In most cases, yes, but always consult your veterinarian before starting supplements. Some may interact with heart or pain medications common in senior Cavaliers.

9. How do I know if my Cavalier needs a joint supplement?

If your dog hesitates to jump, has trouble climbing stairs, or shows stiffness after rest, joint supplements could provide relief and improve mobility.

10. Can I give human supplements to my senior Cavalier?

No, human supplements are not always safe for dogs and may contain harmful ingredients. Always use pet-specific formulas designed for dogs.

11. How long does it take to see results from supplements?

It depends on the supplement. Joint and skin/coat improvements may take 4–6 weeks, while probiotics often show digestive benefits within a few days.

12. Do Cavaliers with heart problems benefit from taurine supplements?

Yes. Taurine supports heart function and can be particularly beneficial for breeds like Cavaliers that are predisposed to heart disease.

13. What’s the best way to give supplements to a picky senior Cavalier?

Soft chews, flavored powders, or mixing liquid supplements into their food usually works best for picky eaters.

14. Are natural supplements better than synthetic ones for Cavaliers?

Natural supplements are often easier to absorb and gentler on the stomach, but the quality of the product matters more than whether it’s natural or synthetic.

15. Should supplements replace a balanced diet for my senior Cavalier?

No. Supplements should complement, not replace, a high-quality senior dog diet. Nutrition from whole foods remains the foundation of good health.

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 Cavalier

Choosing the Best Supplements for a Senior Cavalier

As Cavaliers 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 Cavalier 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 Cavalier’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.