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Immune Supporting Toppers

Toppers & Treats

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A strong immune system is your dog’s first line of defense against illness and disease. Antioxidants found in colorful fruits and vegetables help neutralize harmful free radicals that can damage cells and DNA. By supporting your dog’s natural immunity, you can help her fight off infections, recover more quickly from illness, and potentially reduce her risk of developing chronic health issues.

Carrots

Benefits: Carrots contain beta carotene, a natural plant pigment that converts to vitamin A in your dog’s body. It helps strengthen your dog’s immune system by boosting antibody production and enhancing immune cell activity, while the vitamin A also maintains healthy skin and mucous cells.

Serving Size:

  • Small dog (< 20 lbs): 1-3 carrot slices
  • Medium dog (21-50 lbs): 5-6 carrot slices
  • Large dog (> 51 lbs): Handful of carrot slices

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve:

  • Can be fed both cooked or raw. Cooked carrots are easier for your dog to digest.
  • Preparation methods include boiling, steaming, or pureeing.
  • Wash, peel, and cut into small slices as they may present a choking hazard for smaller dogs.
  • Feed as a healthy treat or directly on food.

Shiitake Mushrooms

Benefits: According to a peer-reviewed study, dogs fed shiitake mushrooms showed an increase in antioxidant activity. Antioxidants can help boost your dog’s immune defenses, battle infections, decrease inflammation, and provide protection against chronic diseases.

Serving Size: 1 tsp of cooked mushrooms per 10 lbs of body weight.

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve: You can serve your dog mushrooms 3 different ways:

  1. Using store-bought mushrooms, wash then cook them thoroughly to make them digestible for your dog.
  2. Buy dried mushrooms, soak them in water for several hours until soft, then cook them.
  3. Feed Real Mushroom’s Mushroom Immune Chews directly to your dog or add to his meal.

Important:

  • Do not feed your dog wild mushrooms as they may be toxic.
  • Dogs can safely eat any store-bought mushrooms that are also safe for you to eat.
  • Store-bought mushrooms must be cooked because it can be difficult to digest in raw form.

Chicken Liver

Benefits: Chicken liver is a rich source of iron. Iron helps your dog’s body utilize oxygen effectively and produce new red blood cells. This essential mineral is also important for cell division and maintaining immune system health.

Serving Size: 2-3 oz per 50 lbs of body weight.

Frequency: Limit to 1-3 times per week if feeding as a topper.

How to Serve: Feed gently cooked or dehydrated.

  • To gently cook, simmer the chicken liver in a pan over low-medium heat until it starts to brown.

Important:

  • Feeding raw meat increases the risk of bacterial and parasitic infections. Dogs with weakened immune systems should avoid this risk.
  • If there is already liver in your dog’s diet or your dog’s food contains a synthetic copper supplement, adding more liver may risk exceeding copper intake.

Spirulina

Benefits: Spirulina is a blue-green algae. Research shows that even small amounts of spirulina can balance and stabilize the immune system. It contains beta carotene, B vitamins, iron, essential fatty acids, and other essential nutrients, which all work together to boost cellular health and provide increased energy for healing.

Serving Size:

  • Small dog (< 20 lbs): ¼ tsp
  • Medium dog (21-50 lbs): ½ tsp
  • Large dog (> 51 lbs): 1 tsp

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve: Spirulina is typically sold in powder form. Sprinkle onto your dog’s food.

Strawberries

Benefits: Strawberries are one of the best food sources of antioxidants. Antioxidants help neutralize free radicals, unstable molecules that can damage DNA and cause diseases. Scientists have discovered that the plant compound in strawberries called “fisetin” also kills cells known for premature aging.

Serving Size:

  • Small dog (< 20 lbs): 1-2 small pieces
  • Medium dog (21-50): 3-4 small pieces
  • Large dog (> 51 lbs): Up to 5-6 small pieces

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve:

  • Strawberries are on Environmental Working Group’s The 2024 Dirty Dozen™ list. It’s best to buy organic.
  • Wash, remove the green stem to prevent stomach upset, and chop into smaller pieces as they may present a choking hazard for smaller dogs.
  • Feed as a healthy treat or directly on food.

Beef Spleen

Benefits: Beef spleen is an organ meat high in iron, which is crucial for delivering oxygen throughout your dog’s body to prevent weakness and fatigue. Beef spleen also contains nutrients that boost immune function by activating white blood cells to combat infections and cancer.

Serving Size: No more than 5% of your dog’s daily calories.

Frequency: Limit to 1-3 times per week if feeding as a topper.

How to Serve: Feed raw, gently cooked, or dehydrated.

  • To gently cook, simmer the beef spleen in a pan over low-medium heat until it starts to brown.

Important: Feeding raw meat increases the risk of bacterial and parasitic infections.

Reishi Mushrooms

Benefits: Known as the “Mushroom of Immortality”, reishi mushrooms have protective, anti-aging, and rejuvenating health benefits. Reishi mushrooms both increase and decrease certain immune system functions to help regulate the immune system.

Serving Size: 1 tsp of cooked mushrooms per 10 lbs of body weight.

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve: You can serve your dog mushrooms 3 different ways:

  1. Using store-bought mushrooms, wash then cook them thoroughly to make them digestible for your dog.
  2. Buy dried mushrooms, soak them in water for several hours until soft, then cook them.
  3. Sprinkle Real Mushroom’s Daily Dawg Powder directly onto your dog’s regular meals.

Important:

  • Do not feed your dog wild mushrooms as they may be toxic.
  • Dogs can safely eat any store-bought mushrooms that are also safe for you to eat.
  • Store-bought mushrooms must be cooked because it can be difficult to digest in raw form.

Red Bell Peppers

Benefits: Red bell peppers are high in vitamin C, a powerful antioxidant and inflammation fighter. It helps to neutralize free radicals, unstable molecules that can damage DNA and cause diseases, and supports a healthy immune response.

Serving Size:

  • Small dog (< 20 lbs): ¼ of a bell pepper
  • Medium dog (21-50 lbs): ⅓ of a bell pepper
  • Large dog (> 51 lbs): ½ of a bell pepper

Frequency: Safe to feed daily. We recommend rotating toppers for variety.

How to Serve:

  • Wash, cut out the seeds and stem, and chop into smaller pieces.
  • Dogs can eat bell peppers raw, but cooking them breaks down their cell walls to enhance antioxidant absorption.
  • Cooking them too long, especially by boiling or steaming, can lower their vitamin C levels.

Herring

Benefits: Herring and other small oily fish, such as sardines, anchovies, and smelt, are high in omega-3 fatty acids. Animal research revealed that omega-3 fatty acids can help regulate your dog’s immune system.

Serving Size: 12 oz per 50 lbs of body weight.

Frequency: Limit to two or three times per week.

How to Serve:

  • Herring can be purchased fresh, frozen, canned, and dehydrated.
  • If buying canned herring, purchase herring canned in water only with no added oils, salt, or spices.
  • Cook herring all the way through to an internal temperature of at least 145°F.

Recommended Products

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Frequently Asked Questions

Q: How much of these toppers can I add to my dog’s bowl?

These toppers can be used to boost your dog’s current food using the 90/10 rule, where you feed 90% of your dog’s current food and 10% of the above toppers. Adding only 10% of the above toppers will not “unbalance” your dog’s current food. If you’d like to add more than 10% fresh food toppers, you need to ensure the fresh food you’re adding is a nutritionally complete meal.

Q: How do I calculate how much kibble to replace?

(Daily amount of kibble fed) x (% of fresh food you’re adding)

3 cups of kibble daily x 10% fresh food toppers

= 0.3 cups of kibble to remove

Dr. Katie Kangas empowers pet parents across the globe with actionable knowledge, holistic care, and beneficial products, helping pets to be more resilient to disease and live better quality lives. She owns and operates Integrative Veterinary Care, with an approach focusing on preventative health and supporting natural healing or wellness through many holistic options in combination with traditional veterinary medicine.

For more information, check out Dr. Katie Kangas’ Consultation Services.

For more information:

  • ‌2025 Integrative Veterinary Care. Consultation Services.
  • Victoria Lynn Arnold. “Can Dogs Eat Carrots?” Petmd.com, PetMD, 30 Aug. 2022, www.petmd.com/dog/nutrition/can-dogs-eat-carrots.
  • MS, Dr Rob Silver DVM. “Can Dogs Eat Mushrooms? Facts about Fungi for Your Furry Friend.” Real Mushrooms, 6 Dec. 2021, www.realmushrooms.com/can-dogs-eat-mushrooms/.
  • Kusaba, Akio, and Toshiro Arai. “Shiitake mushroom powder supplementation increase antioxidative activity in dogs.” Frontiers in veterinary science vol. 11 1355560. 19 Jun. 2024, doi:10.3389/fvets.2024.1355560
  • DogCancer.com. “Liver for Dogs – DogCancer.com.” DogCancer.com, 2 May 2023, www.dogcancer.com/articles/diet-and-lifestyle/liver-for-dogs/.
  • ‌Satyaraj, Ebenezer et al. “Supplementation of Diets With Spirulina Influences Immune and Gut Function in Dogs.” Frontiers in nutrition vol. 8 667072. 28 May. 2021, doi:10.3389/fnut.2021.667072
  • Scott, Dana. “The Health Benefits of Spirulina for Dogs.” Dogs Naturally – Natural Dog Health and Nutrition, Dogs Naturally, 15 June 2011, www.dogsnaturallymagazine.com/benefits-of-spirulina/.
  • ‌Habib, Rodney, and Karen Shaw Becker. The Forever Dog Life. HarperCollins, 28 May 2024.
  • ‌Carlsen, Monica H et al. “The total antioxidant content of more than 3100 foods, beverages, spices, herbs and supplements used worldwide.” Nutrition journal vol. 9 3. 22 Jan. 2010, doi:10.1186/1475-2891-9-3
  • DogCancer.com. “Antioxidants for Dogs – DogCancer.com.” DogCancer.com, 2 May 2023, www.dogcancer.com/articles/supplements/antioxidants-for-dogs/.
  • MeganM. “Can Dogs Eat Strawberries? | Trinity Veterinary Hospital.” Trinity Veterinary Hospital, 27 Feb. 2025, trinityveterinaryhospital.com/blog/can-dogs-eat-strawberries/. Accessed 8 Apr. 2025.
  • ‌‌Habib, Rodney, and Karen Shaw Becker. The Forever Dog Life. PREBIOTIC-RICH FRESH FOODS You Can Share with Your Pets.
  • ‌Henriques, Julia. “Can Dogs Eat Seafood?” Dogs Naturally – Natural Dog Health and Nutrition, Dogs Naturally, 18 Mar. 2022, www.dogsnaturallymagazine.com/can-dogs-eat-seafood/.
  • ‌Kamlet, Joni. “Reishi Mushroom for Dogs | Real Mushrooms.” Real Mushrooms, 31 Jan. 2023, www.realmushrooms.com/reishi-mushroom-for-dogs/.
  • ‌Real Mushrooms. “Medicinal Mushrooms for Pets.” Real Mushrooms, 7 July 2020, www.realmushrooms.com/medicinal-mushrooms-pets/.
  • ‌“Diets to Boost Immunity.” Cornell University College of Veterinary Medicine, 30 Sept. 2022, www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information/diets-boost-immunity.
  • ‌‌“Nine Vegetables That Are Healthier for You When Cooked • HRI.” Heart Research Institute, www.hri.org.au/health/your-health/nutrition/nine-vegetables-that-are-healthier-for-you-when-cooked.
  • DogCancer.com. “Bell Peppers for Dogs – DogCancer.com.” DogCancer.com, 24 May 2023, www.dogcancer.com/articles/diet-and-lifestyle/bell-peppers-for-dogs/.
  • Bauer, John E. “Responses of dogs to dietary omega-3 fatty acids.” Journal of the American Veterinary Medical Association vol. 231,11 (2007): 1657-61. doi:10.2460/javma.231.11.1657
  • DogCancer.com. “Can Dogs Eat Fish? Yes! – DogCancer.com.” DogCancer.com, May 2023, www.dogcancer.com/articles/diet-and-lifestyle/can-dogs-eat-fish/.

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