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

Can You Shave a Cat With Human Clippers? Facts to Consider & Tips

Sometimes a cat might need shaving. While this is pretty rare, you might find yourself needing to clip your cat’s coat for a...

Bringing My Cat on a Romantic Weekend Away: Raphael Goes to York

Welcome to the Wednesday Cats of Catster! Every week, we share a story from one of our cat-loving Catsters. This week is about...

Tidy Cats Litter Review in 2025: Recalls, Pros & Cons

Review Summary Although brand recognition does not equal quality or performance, Tidy Cats from Purina is one of the best-known names in cat...

Toyger Cat Health Problems: 7 Vet-Reviewed Issues

It’s not uncommon for purebred cats to have an inherited health condition, which is why it’s a good idea for potential owners to...

More related

Simon’s Cat vs. The World by Simon Tofield (2025 Review)

You know Simon’s Cat from his YouTube videos. It all started with Cat Man Do, which I believe was the original Simon’s Cat...

How Much Does a Cat Cost in the UK? 2025 Care & Supplies Guide

Getting a new cat is always an exciting experience. You might have fallen in love with a particular breed or found a heart-breaking...

How to Bond With Your Cat: 12 Vet-Approved Options

Owning a cat is one of life’s great pleasures, but sometimes, it can feel like we need them more than they need us....

How to Tell if a Dog Will Be Aggressive Towards Cats? 8 Vet-Reviewed Signs to Look For

Cats and dogs are often portrayed as mortal enemies in pop culture, but in reality, they can be completely disinterested in one another...

Keep reading

My Cat Died at Home, What Do I Do? 7 Vet-Reviewed Steps to Take

A pet’s passing is a painful and emotional time for everyone who loved and was loved by them. In some cases, we know when our pet is declining and can mentally prepare for their passing and say our goodbyes, but...

cremated remains of a pet cat

How Do Cats Greet Each Other? Feline Communication Explained

We know how cats typically say hello to us, but how do they greet each other? Cats say hello to each other by touching their noses, often followed by mutual head-rubbing and sometimes butt-sniffing. This is because cats largely rely...

two cats_Thomas B., Pixabay

Why Does My Cat Hide and Sleep in the Closet? 9 Vet-Reviewed Reasons & Tips

Cats are fun pets, but they can exhibit many strange behaviors, one being hiding and sleeping in the closet. We know it can be alarming when your pet suddenly disappears, especially if you aren’t sure why your cat might be...

ginger cat hiding in the closet

Why Is My Cat Acting Weird? 10 Vet Reviewed Reasons

From manic midnight zoomies to suddenly hiding away from you, cats do some pretty strange things. You know your cat’s “normal” behavior best, so it can be alarming when they do something that’s not only weird, but also out of...

sad sick cat in bed

Are Tulips Toxic to Cats? Vet-Reviewed Safety Information

Tulips are beautiful flowers, so there is no question why they are so popular. They are common inside and outside. Many cut flower bouquets include tulips, for instance. However, tulips are toxic to cats and many other pets. Because flowers...

Catster_Are Tulips Toxic to Cats

Can Cats Eat Hemp Seeds? Vet-Reviewed Facts & FAQ

Cats like to explore their surroundings, and their adventures often lead them to foods and items they should avoid. With cannabis products becoming more available in the United States, pet parents may be concerned that hemp-related substances are toxic or...

Can Cats Eat Hemp Seeds

Can Cats Eat Rotisserie Chicken? Vet-Approved Risks & FAQ

Rotisserie chicken is a delicious and versatile food that many humans regularly consume. Just the smell of fresh, warm rotisserie chicken brings most cats running, but is it okay for cats to eat? While plain chicken is a healthy protein...

Can Cats Eat Rotisserie Chicken

Can Cats Eat Lentils? Vet-Reviewed Nutritional Facts & FAQ

We’ve all heard that curiosity killed the cat, and that saying has a foundation in reality; cats explore their world with their mouths, and ingesting foreign substances and objects can be fatal! Lentils are a superfood for humans that packs...

Catster_Can Cats Eat Lentils_v1_Dec 3 2024