Dog Health

Can Dogs Eat Natto? Risks and Vet Advice

Curious if dogs can eat natto? Discover the benefits, risks, and expert vet advice on feeding your furry friend this fermented soybean dish.
Author: Veterinary Team
Dial A Vet
Updated
May 25, 2025
|
Published
May 25, 2025
A dog curiously sniffing a bowl of natto on a wooden table, illustrating dietary considerations for pets.

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Dogs are known for their curiosity when it comes to food, and as a pet parent, you may wonder if your furry friend can safely eat natto. This traditional Japanese dish made from fermented soybeans is rich in nutrients for humans, but is it safe for dogs? Let’s explore the potential benefits, risks, and vet advice about feeding natto to dogs.

🍽 What Is Natto?

Natto is a staple in Japanese cuisine, made by fermenting soybeans with a specific type of bacteria called Bacillus subtilis. It has a strong smell, sticky texture, and a nutty, slightly bitter flavor. Natto is celebrated for its high protein content, probiotics, and rich supply of vitamins such as K2 and B vitamins.

While natto may seem like a healthy snack, it’s essential to understand how it interacts with your dog’s digestive system before adding it to their diet.

🐕 Can Dogs Eat Natto?

The short answer is yes, dogs can eat natto in small amounts, but there are several factors to consider. Natto is not toxic to dogs, but it contains ingredients and properties that may not suit every canine. Let’s break it down:

  • Natto is high in protein, which is beneficial for dogs in moderation.
  • It contains probiotics that may support gut health.
  • However, the fermentation process makes natto harder for some dogs to digest.
  • Soybeans are a common allergen, and some dogs may react poorly to them.

As with any human food, moderation is key, and it’s always best to consult your vet before introducing natto to your dog’s diet.

⚠️ Risks of Feeding Natto to Dogs

While natto is not inherently harmful, there are potential risks to consider. Feeding your dog natto without understanding these risks could lead to digestive upset or other health issues.

  • High sodium content: Some types of natto contain added salt, which can be harmful to dogs in large amounts.
  • Allergic reactions: Dogs with soy allergies may experience itching, gastrointestinal upset, or skin irritations after eating natto.
  • Gas and bloating: The fermentation process can make natto difficult for some dogs to digest, potentially leading to gas, bloating, or diarrhea.
  • Unfamiliar texture: The sticky, stringy texture of natto may be unappealing or even a choking hazard for some dogs.

If you notice any signs of discomfort or an allergic reaction after your dog eats natto, stop feeding it immediately and contact your veterinarian.

🩺 How to Safely Feed Natto to Dogs

If you’d like to share natto with your dog, follow these tips to minimize risks and maximize potential benefits:

  • Start small: Offer a tiny amount of plain, unsalted natto to see how your dog reacts.
  • Avoid additives: Ensure the natto is free from added salt, seasonings, or sauces like mustard, which can be harmful to dogs.
  • Watch for reactions: Observe your dog for signs of digestive upset or allergies, such as vomiting, diarrhea, or itching.
  • Mix it with their food: If your dog enjoys natto, mix a small portion with their regular meal for easier digestion.

Always remember that natto should be an occasional treat and not a replacement for a balanced canine diet. Too much natto can disrupt your dog’s nutrition or cause digestive discomfort.

🧬 Potential Benefits of Natto for Dogs

When given in moderation, natto may offer some health benefits for dogs. Here are a few potential perks:

  • Probiotics: The fermentation process creates probiotics, which may support a healthy gut microbiome and improve digestion.
  • Vitamin K2: Natto is rich in vitamin K2, which plays a role in bone health and calcium metabolism.
  • Protein: The high protein content in natto can provide energy and support muscle development.

It’s important to note that these benefits are not unique to natto. Many dog-friendly foods, such as yogurt or lean meats, can offer similar advantages without the risks associated with soybeans or fermentation.

🐾 Signs Your Dog Should Avoid Natto

Some dogs may not tolerate natto well, even in small amounts. If you notice any of the following symptoms after feeding natto, it’s best to stop immediately and consult your vet:

  • Vomiting or diarrhea
  • Excessive gas or bloating
  • Itching or skin irritation
  • Lethargy or lack of appetite

Dogs with known soy allergies, sensitive stomachs, or pre-existing health conditions should avoid natto altogether unless advised otherwise by a veterinarian.

FAQs

Can puppies eat natto?

Puppies have sensitive digestive systems, so it’s best to avoid feeding them natto. Stick to a balanced puppy diet recommended by your vet.

Is natto better than regular soybeans for dogs?

Natto’s fermentation process adds probiotics, but it also makes it harder to digest. Plain, cooked soybeans may be a safer alternative for dogs without soy allergies.

How much natto can I give my dog?

Start with a teaspoon or less for small dogs and a tablespoon for larger breeds. Always monitor for adverse reactions and consult your vet for guidance.

What should I do if my dog has an allergic reaction to natto?

If your dog shows signs of an allergic reaction, such as itching, vomiting, or swelling, contact your vet immediately for advice.

References

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While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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