Get

In Your Inbox

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

Can Cats Eat Seaweed? Vet-Approved Nutrition Facts & FAQ

Can Cats Eat Seaweed

It is no secret that most cats are fans of fish, and if you have a particularly keen cat, they might try to scoop fish out of your fish tank! Tuna and cats, for example, have been linked for generations. But can cats eat seaweed? If a cat loves fish, will they also like a side of seaweed to go with it? Yes; it may come as a surprise, but many cats enjoy eating seaweed. Seaweed is safe for cats, in moderation.  But is it good for them?

This brief guide will cover everything you need to know about cats and seaweed, including if they can eat seaweed sheets, whether nori is safe, and the health benefits of seaweed. It also covers how to feed seaweed to a cat and the seaweed to avoid.

divider cat faces oct 2024

Can Cats Have Seaweed?

Seaweed has several benefits for cats when it is prepared properly. The two biggest concerns with seaweed are the quantity of seaweed and the harmful ingredients that sometimes lurk in processed seaweed. However, cats can have seaweed as long as it is plain and unseasoned, and it can even be considered a healthy snack when consumed in this way.

There are no known species of seaweed that are deadly to cats, and of the 1,2000 estimated species of seaweed, there are only three that have ever been linked to illness (in humans) due to heavy metals within the seaweed, not the seaweed itself.

Although it is safe, not all cats will like seaweed. Some cats will refuse to eat it, and that is perfectly fine. Cats evolved to eat small animals and not seaweed. Plain seaweed can be used as a treat or supplement to add variety and nutritional benefits to your cat’s diet.

Seaweed on plate with chopsticks
Image by: Jeong-Seon, Shutterstock

Can Cats Eat Seaweed Sheets?

Cats can eat seaweed sheets as long as they are made of simple, plain seaweed. Seaweed sheets are flattened and packaged for shipping, and several companies sell them so that they can be used easily to make wraps.

Can Cats Eat Nori?

Sometimes, cats can eat nori. Nori is a Japanese culinary seaweed made from species in the genus Pyropia, including specific species P. yezoensis and P. tenera. Pyropia is a type of red algae and is typically flattened into sheets and then used to wrap sushi or dried to create flat, crunchy snacks.

Plain nori is safe for cats, but some products are treated with preservatives or salt to make them last longer. Be sure to check and ensure that any nori you are using is plain seaweed with no extra ingredients.

Nori is commonly used to create sushi wraps. If your cat gets into sushi, they will likely end up eating nori. Nori in sushi is generally safe for cats as long as there are no other ingredients in it.

Crispy-nori-seaweed-in-the-bowl
Image by: Viktorya Telminova, Shutterstock

divider cat faces oct 2024

Is Seaweed Good for Cats?

Yes, in moderation. Seaweed has several health benefits for cats, but it must be used as a supplement and not replace a balanced cat food diet.  It should only be fed in small quantities since some (dried) seaweeds can expand in the stomach, which could, in theory, cause a blockage.

Seaweed is filled with helpful prebiotics that promote gut health for kitties, and it is also high in fiber, so it helps regulate intestinal motility and reduce constipation.  Additionally, seaweed has a number of amino acids that help with coat and skin health. Cats that eat supplemental seaweed are said to have shinier and healthier coats over time due to the concentration of omega-3 fatty acids.

Seaweed also contains several vitamins and minerals, as well as a slew of antioxidants. The antioxidants can reduce the number of free radicals in your cat, and they can also help reduce inflammation. It does not take much seaweed for your cat to obtain these benefits.

Benefits:
  • Vitamins and minerals
  • Iodine helps maintain a healthy thyroid but is only beneficial in moderate amounts.
  • Vitamins A, E, and B12 maintain healthy skin, vision, immune function, and energy levels in cats.
  • Magnesium and Potassium benefit the heart, nerve impulses, and muscle control.
  • Amino acids
  • Fatty acids
  • Antioxidants
  • Promotes shiny coats

Seaweed to Avoid

While seaweed is safe and nontoxic for cats to eat, there are still some products that you need to avoid. There are many seaweed snacks and processed seaweed products that are not suitable for cats. You only want to feed your cat plain seaweed and avoid anything that has flavoring or spices.

Large quantities of salt, wasabi, and other spices are not healthy for your cat to eat. Some seaweed is processed into chips and crackers, and it has sodium and calories that your cat doesn’t need. For these reasons, the seaweed snacks should be avoided.

When in doubt, check the packaging and the ingredients. Buy and feed only plain seaweed instead of processed or flavored seaweed. Of course, if you would be in doubt, the easiest thing you can do is reaching out to a veterinarian and ask them for an advice.

Need veterinary advice but can't get to the clinic? Catster recommends PangoVet, our online veterinary service. Talk to a vet online and get the answers and advice you need for your cat without having to leave your living room — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

How Best to Feed Your Cat Seaweed

While some seaweed is safe for cats, they are not designed to live on a hefty diet of plant matter. Cats are obligate carnivores that get most of their nutrients from animal meat. Although cats can eat seaweed, you should only consider it a snack, supplement, or treat. You do not want it to be a main meal for your cat or an everyday staple.

Seaweed can benefit your cat, but only in small quantities. You want to be sure to moderate your cat’s portion sizes since seaweed naturally contains high levels of iodine that might not be suitable for your cat in large quantities.

To feed seaweed to your cat, be sure to get plain seaweed and serve it in small bites once a week, not daily. You can also rip the seaweed into small pieces and add it to your cat’s regular dry food. It will act more as a supplement, but your cat should eat it alongside their meal. Again, do not do this every day. Only do it once in a while.

fresh and dried japanese wakame seaweed
Image by: maramorosz, Shutterstock

divider cat faces oct 2024

So, Can Cats Eat Seaweed?

So now we know that cats can eat seaweed and it can even be a beneficial snack, but remember you should not serve large portions of seaweed to your cat. You can use seaweed as a special treat, snack, or supplement. If you feed plain seaweed to your cat occasionally, they’ll benefit from a range of antioxidants and vitamins. Many cats love seaweed and will happily eat it if you give them the chance. Just be sure to use plain seaweed without any additional ingredients.

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Here’s Your New Feline Comic Reporting Service — It’s Called “Breaking Cat News”

Do you ever find yourself wondering why there is not a dedicated cat-centric news outlet? Ponder no more, as Breaking Cat News is...

Where to Put Your Cat’s Litter Box: 12 Tips for Choosing the Perfect Location

A necessary part of bringing a new cat into your home is buying them a litter box. But just like how getting the...

The Dark Side of Cat Cloning: Cost, Process, Ethics & More

In the almost three decades since the creation of Dolly, the world’s first cloned sheep, the technology of cloning has been tweaked and...

Siamese Kittens for Sale in Virginia: Breeders List 2025

Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

More related

Can Cats Eat Mac & Cheese? Vet-Reviewed Info to Know!

Most cats love cheese, and when this feline favorite is mixed in with a bit of butter, milk, and pasta, it becomes the...

10 Best Cat Foods Made in the USA in 2025 – Reviews & Top Picks

Choosing high-quality cat food is a hugely important decision when it comes to the health of your beloved pet. You might have been...

Why Do Cats Groom Humans? 8 Vet Reviewed Reasons

You can be sitting on the couch and scrolling on your phone when, all of a sudden, you start to feel an unusual...

European Shorthair Cat Breed Info: Pictures, Temperament & Traits

In Europe, the European Shorthair cat is widely considered to be the most popular breed of housecat. They have lively personalities brimming with...

Keep reading

Why Is My Cat Scratching the Walls? 6 Likely Reasons

Cats do what they want to do. If you have cats in your home, you’re already fully aware of this. Unfortunately, there are times when our beloved kitties push the boundaries and do things around the house they shouldn’t be...

cat trying to climb a wall

Can a Male and Female Cat Get Along? Vet-Reviewed Info

When it comes to cat compatibility, there are various factors at play, rather than just their gender. How well and whether two cats will get along, will mainly depend on the cat’s personality, early socialization, previous experiences with other cats,...

Can Male and Female Cats Get Along

Can Cats Drink Vinegar? Vet-Verified Health & Safety Facts

Vinegar is one of those pantry staples that most people have in their kitchens. It can be used in salads, marinades, and homemade cleaners. Some people even add a splash of apple cider vinegar to their water for its researched...

Can Cats Drink Vinegar

Can Cats Eat Thyme? Vet-Reviewed Facts

Cats are obligate carnivores, which means the vast majority of their dietary intake should come from meat and other animal-based ingredients. However, it is not unusual for cats to also be given fruit, vegetables, and certain herbs, especially in commercial...

Can Cats Eat Thyme

Can Cats Eat Scallops? Vet-Approved Facts & FAQ

Cats eating fish and other seafood is a common trope, but you may be wondering if it’s safe for them to have. Scallops are a common and nutritious meal for people, but what about cats? Can cats eat scallops? Is...

Can Cats Eat Scallops

Why Do Cats Cry at Night? 8 Vet-Reviewed Reasons

Our cats are creatures of the night, so it’s no wonder you hear them howling their song into the echoing chambers of the house when all are sleeping. With as much as you’re getting used to the sound of a...

Ginger tabby young cat sitting on a wooden floor looks up, asks for food, meows

8 Best CBD Oils for Cats (2025) – Reviews & Top Picks

You’ve probably noticed that CBD oil has become all the rage in the past few years. There’s a good reason for that. When it comes to humans, CBD oil1 can help prevent seizures, may help relieve anxiety and insomnia, and...

orange cat smelling CBD oil

My Cat Drank Christmas Tree Water! What Should I Do? Vet Approved Advice

A real tree at Christmas time recalls memories of past holidays. Perhaps you even went to cut one down or remember decorating one when you were young. However, while they bring us warmth and joy during Christmas, a real tree...

tabby cat sitting behind the christmas tree