Vitamin C for Dogs: 12 Best Foods and Dosages (2025)

Did you know that dogs also need vitamin C? Although their bodies produce it naturally, there are times when a boost can make all the difference. In this blog, we'll tell you what vitamin C is, what its real benefits are for your dog, whether dogs can consume human vitamin C, how to identify a deficiency, which natural foods contain it, and the best safe alternative to incorporate it into their routine. If you're interested in improving your dog's health from the inside out, this content is for you.

What is vitamin C?

Vitamin C, also known as ascorbic acid, is an essential nutrient with antioxidant properties that helps protect the body's cells from damage caused by free radicals. Although dogs can produce vitamin C on their own in their liver, in certain situations, it may be beneficial to provide extra support through diet or supplements, always under the guidance of a veterinarian.

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Benefits of vitamin C for dogs

• Strengthens the immune system : It can help keep the immune system strong, especially in dogs exposed to stress, illness, or during recovery from surgery or infection.

• Combats oxidative stress : Thanks to its antioxidant properties, vitamin C helps neutralize free radicals that can damage tissues, which is useful for older dogs or those with chronic diseases.

• Promotes joint health : Vitamin C can support the production of collagen, a vital protein for keeping joints, tendons, and ligaments strong and flexible. This can be especially helpful for dogs with age-related joint wear and tear or certain large breeds, always under the supervision of a veterinarian. To complement this care, you can rely on natural dog treats like Waggy's Mobility, formulated with ingredients that help maintain your dog's mobility and flexibility at every stage of life.

• Supports Brain Health : In older dogs, vitamin C has been studied for its role in supporting cognitive function, helping to maintain a more alert mind for longer.

Do dogs produce vitamin C naturally?

Yes, unlike humans, dogs can synthesize vitamin C themselves in the liver from glucose. However, there are situations in which this natural production may not be sufficient, such as in cases of stress, illness, aging, or intense physical exertion, where the body demands more vitamin C than it can produce. In these cases, an extra supply through diet or supplements can be beneficial, provided veterinary guidance is provided.

Symptoms of vitamin C deficiency in my dog

Although uncommon due to its ability to synthesize, a vitamin C deficiency may occur in situations of high stress or compromised health. Some signs to watch for include:

• General fatigue or weakness : Your dog seems more tired or apathetic than usual.

• Swollen or bleeding gums : Dental problems without an apparent cause could be related to collagen deficiency, which is dependent on vitamin C.

• Increased susceptibility to infections : A weakened immune system can result in more frequent illnesses or slow recovery.

• Joint pain or stiffness : Vitamin C deficiency can affect the production of collagen, which is essential for healthy joints.

• Delayed wound healing : Wounds take longer than normal to heal.

If you notice these symptoms, it's important to consult your veterinarian for a full evaluation and consider alternatives such as natural supplements that include vitamin C for preventative or therapeutic support.

What foods have vitamin C for dogs? The 12 best

Although these foods do not always provide high amounts of vitamin C, they can complement a balanced diet and offer natural antioxidant benefits:

• Acerola : A tropical fruit with a very high vitamin C content. It helps strengthen the immune system, has antioxidant properties, and is ideal for maintaining healthy skin and coat. It's one of the key ingredients in Waggy's SHINE, the ideal supplement to prepare your dog's coat for summer.

• Spinach : Rich in vitamin C, iron, and fiber. Cooked (without salt or seasoning), it supports digestive health.

• Strawberries : They provide vitamin C and natural antioxidants that promote a strong immune system.

• Broccoli : Steamed, it offers vitamins C, K and fiber, supporting bone health.

• Parsley : In small doses, it provides vitamin C and anti-inflammatory compounds.

• Fish (such as salmon or sardines) : Although it is not rich in vitamin C, it provides omega-3 which, combined with this vitamin, enhances antioxidant benefits.

• Papaya : Rich in digestive enzymes and vitamin C, it aids digestion.

• Pumpkin : Contains vitamin C, beta-carotene, and fiber. Supports digestion and the immune system.

• Kale : Loaded with antioxidants, calcium and vitamin C.

• Mango : Rich in vitamin C and A. Should be offered without peel or pit.

• Apple (seedless) : Provides vitamin C and fiber. Ideal as a refreshing snack.

• Carrot : Rich in vitamin C and beta-carotene, it also helps clean teeth.

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Other safe vitamin C alternatives for dogs

Waggy's SHINE dog supplements : the ideal choice for a healthy coat and a strong immune system

Star ingredient, natural acerola: SHINE is formulated with acerola, one of the richest sources of natural vitamin C. This super ingredient supports the immune system, helps combat oxidative stress, and improves collagen production, essential for skin and joint health. In addition to acerola, SHINE contains biotin, zinc, and omega-3, making it a complete supplement to strengthen coats, reduce hair loss, and improve the overall appearance of skin, from the inside out.

It comes in soft treats with weight-adjusted doses, making it easy to administer safely daily. SHINE contains no artificial colors, synthetic flavors, or added sugars. With consistent use, many owners report improvements such as less shedding, a shinier coat, and a boosted immune system. It's ideal for dogs that are shedding, live in extreme climates, or simply need extra care.

Recommendations for providing vitamin C to your dog

• Always consult with your veterinarian : Before adding any supplement, even a natural one, it is important to ensure that your dog needs it.

• Choose safe sources designed for dogs : Avoid human supplements that may contain unsafe ingredients.

• Introduce vitamin C gradually : This way you can monitor your dog's tolerance.

• Adjust the dose according to weight : In general, between 5 and 20 mg per kilo of weight per day, but it may vary depending on the case.

• Watch for side effects : Excessive use may cause diarrhea or stomach upset. If this occurs, discontinue use and consult your veterinarian.

• Prefer supplements with additional benefits : Like SHINE, which combines natural vitamin C with other functional nutrients.

What is the correct dosage?

Vitamin C dosages for dogs can vary, but the recommended daily dose is generally 5 to 20 mg per kilogram of body weight. While healthy dogs don't typically need supplements, during times of stress, aging, or illness, a veterinary-supervised booster may be helpful.

Are there any side effects from taking too much vitamin C?

Yes. Although it's a water-soluble vitamin, high doses can cause side effects such as diarrhea, stomach upset, or even urinary stones in some dogs. Therefore, it's always best to follow veterinary recommendations and avoid excesses.

Can dogs take vitamin C from humans?

In general, giving human supplements to dogs is not recommended. These may contain inappropriate dosages or ingredients that are unsafe for them. It's best to opt for products specifically formulated for dogs.

Conclusion

Vitamin C can be a great ally in strengthening the immune system, supporting joint health, and adding overall well-being to your dog's life, as long as it's administered safely, gradually, and under veterinary supervision. At Waggy's, we're committed to the health, quality of life, and happiness of pets and their families. That's why we create functional products like SHINE, formulated with natural ingredients and designed to care for your furry friend from the inside out. Our commitment is to help you add well-being, confidence, and love at every stage of their life.