Veggies from the Sea: Can Dogs Eat Seaweed?

Is seaweed bad for dogs?

Well, after my pup chewed half of my home-grown seaweed, I was curious. I started researching this on the internet. I came across some contradictory information as folks tried to answer the question, “can dogs eat seaweed?”

There are also plenty of pictures out there showing people giving seaweed to their dogs, so it’s not like it would greatly harm them, right? Or maybe wrong.

We have no idea about the nutritional content, nor the list of ingredients on the seaweed package, or if they fed the seaweed to their dog in a safe way, as experts would recommend.

What Is Seaweed?

Seaweed is a type of marine algae or plant. It’s a type of edible green that grows in the ocean and on lakes. Seaweed has been used for centuries to make food, medicines, and other products—and it’s also been used to create dyes for fabrics.

Seaweed is often eaten raw as a snack or salad ingredient; it can be dried and used as seasoning; it’s also used to make sushi and other foods.

Seaweed contains vitamins A, B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), C, and E. It also provides minerals such as iron, potassium, magnesium, and zinc.

Seaweed is harvested from the ocean and eaten fresh or dried. Some types of seaweed are also used to make medicine or cosmetics. It can be enjoyed raw or cooked, and you can often see them used in sushi rolls!

Are Dogs Safe To Eat Seaweed?

Is seaweed poisonous to dogs? No.

seaweed on the shore

Seaweed, also known as sea vegetables or sea greens, is a type of algae that grows in the ocean. It’s often used in cooking because it contains vitamins and minerals.

The good news for canines: Seaweed is safe for dogs to eat—as long as it has no added ingredients or supplements. But you should know some important things before feeding your dog seaweed. We’ll check all of those out in the next section, but let’s have a look at the different types of seaweed that you can feed your dog:


Kelp is also called sea lettuce, a type of brown algae that grows in cold waters. Kelp is part of the Laminariales family, which includes hundreds of different species. The most common type of kelp used in pet foods is spirulina.

Most varieties of kelp are dark green in color, but some can be purple or red. You might see them growing on rocks near the beach or large rocks near the shoreline. Kelp usually grows in long strands (like hair) attached to rocks or other objects in the ocean. It can grow up to 60 feet long.

Kelps contain high amounts of vitamins A, C, and E and iodine and iron—all things your dog needs for good health.


Nori is a type of red seaweed that is commonly consumed in Asian cultures. It’s dried and pressed into sheets, then used to wrap sushi rolls. It also comes in powdered form, which can be added to food or water as a seasoning. You can find nori in most grocery stores near other Asian foods.

It’s typically a dark green color, but it may also have white streaks running through it, depending on how it’s processed. It has an earthy smell with a hint of seawater and tastes salty when eaten raw.

Can dogs eat nori? Yes. Nori is good for dogs because it contains taurine, which helps with their vision and heart health. It also contains iodine, which helps with dogs’ blood clotting and thyroid function.

nori seaweed sheets with chopsticks

Since some nori are sold seasoned and with different variants, can dogs have seaweed with sesame oil, for example? Yes, dogs can have seaweed with sesame oil. It’s a good source of protein and has many nutritional benefits. Sesame oil is rich in antioxidants and omega-3 fatty acids, which help to reduce inflammation in the body.


Can dogs eat dried seaweed such as kombu?

Kombu has many health benefits for humans, but dogs can also benefit from it. It is high in vitamins A and C, iron, and iodine. It also contains a good amount of protein.

You can find kombu in most grocery stores or Asian markets. You’ll want to look for the long strips of dark green seaweed found in plastic packages or containers.

If you’re unsure what kombu looks like, ask someone who works at the store if they have any available so you can see how it compares to other types of seaweed they might have on hand.


Wakame is a type of edible brown algae that grows along the coastlines of Japan, Korea, and China.

It can be found in both dried and fresh forms. Typically, the dried form is sold as flakes or strands that look like thin noodles or ribbons when rehydrated. The fresh form requires some prep work before you let your dog lick it off your hands or plate.

Wakame is commonly used in Japanese cuisine. It’s an excellent fiber source and is also high in protein and calcium. There are many other health benefits to adding wakame to your dog’s diet—it can help with digestion, strengthen bones, and even improve their coat to make it shinier and healthier-looking.

Sea Grapes

“Can I give my dog seaweed such as sea grapes?”

Sea grapes are seaweed found in the ocean and on beaches. They look like small, olive-green balls, and they grow in bunches. Sea grapes are packed with vitamins and minerals, which are great for your dog’s health!

As long as the sea grapes haven’t been treated with bleach or other chemicals, they’re safe for dogs to eat. Dogs can even eat them raw—just make sure to rinse them well before giving them to your pup!

Sea grapes are rich in calcium, which helps keep your dog’s bones strong. They also contain vitamin C and iron, which help prevent anemia (a lack of red blood cells). The protein in sea grapes helps build muscle mass and repair tissue damage from injuries.

Seaweed’s Nutritional Benefits

Here’s a recap of all the benefits of seaweed for your dog:

seaweed farm
  • Seaweed is a great source of nutrients. They’re rich in vitamins and minerals, such as vitamin C, calcium, iron, and iodine. They’re also high in protein, fiber, carotenoids, and antioxidants. Seaweed is also free of fat, cholesterol, and sodium.
  • Seaweed is a good source of iodine the body needs to make thyroid hormones. This mineral helps to regulate metabolism and growth. It also contributes to healthy skin and hair and normal brain function.
  • Seaweed contains some protein but not enough to be considered a good source of protein by itself. However, it can be combined with other foods that do contain enough protein (such as meats) to make a complete meal for your dog.
  • Seaweed contains significant amounts of fiber which helps to keep your dog’s digestive system healthy by adding bulk to their stool. Hence, it passes through easily without causing constipation or diarrhea. Seaweed also contains some B vitamins.

Seaweed Dangers for Dogs

There are some downsides to feeding seaweed to your dog. First, dogs don’t need to eat seaweed at all—they can get all the nutrients they need from their regular diet.

And if you’re feeding your dog seaweed regularly or in large amounts, it could lead to an imbalance of sodium in their body that could cause health issues down the road.

If you want to give your dog seaweed as a treat every now and then (or even every day), ensure you’re only giving them small amounts—and monitor their sodium levels afterward! Here are some other possible dangers of feeding seaweed to your dog:


Dogs can eat seaweed, but it’s best to avoid feeding them any seaweed that has been seasoned.  Some seasonings commonly used on seaweed dishes—like soy sauce or salt—can be dangerous for dogs if they ingest too much at once.

If you’re going to feed seaweed to your dog, make sure it’s plain and that you’ve removed any seasonings from it first.

Dried Seaweed

Dried seaweed contains high levels of iodine, which can be toxic to dogs. Ingesting too much iodine can cause the thyroid gland to become swollen and inflamed. This condition is called iodism, which can lead to hyperthyroidism in dogs if left untreated.

The symptoms of hyperthyroidism include weight loss, increased thirst and urination, heart arrhythmias (irregular heartbeats), and increased appetite.


If too much iodine is present in their diet, it can affect their thyroid function and cause hyperthyroidism. This condition can lead to weight loss, vomiting, diarrhea, excessive thirst and urination, an irregular heartbeat or rapid heart rate (tachycardia), and other serious conditions like congestive heart failure.

If you want to give seaweed as a treat or supplement to your dog’s daily diet, ensure that you don’t overdo it—especially if you’re also giving them supplements containing iodine.

How To Feed Seaweed To Your Dog

There are many ways to feed seaweed to your dog, but the most common way is through a supplement. You can also mix seaweed into their food or even add it as a topping to their dinner!

small brown dog eating in the living room
  • Supplements: Seaweed supplements are made from dried seaweed and contain all of the nutrients that seaweed has to offer! They’re also packed with vitamins A and C, which promote healthy skin and coats. These supplements come in different forms, like powder, tablets, or capsules, so you can choose whichever works best for your dog.
  • Mixing Seaweed into Their Food: You can easily add seaweed to your dog’s food by mixing it with their regular dog food or adding it as a topping when cooking. You can use any type of seaweed you’d like including dulse flakes (which are great for dogs with allergies), spirulina flakes, or kelp flakes (both of which are good for dogs with thyroid issues).
  • Adding Seaweed as a Topping: If your dog doesn’t mind eating something that looks like grass clippings, they’ll definitely love this topping! Just sprinkle some on top of their dinner before serving it up.

How Much Seaweed Should I Feed My Dog?

The answer to this question depends on a few things.

First, how much seaweed are we talking about? If you’re talking about the dried sheets of seaweed that you can buy at the store, they should be fine for dogs under 10 pounds as long as they’re not too salty.

If you’re talking about fresh seaweed (which tends to be found in sushi restaurants or other Asian food stores), it’s probably best to avoid it since it contains a lot of iodine and salt.

If you have a bigger dog who needs more calories than those sheets of dried seaweed, go ahead and give him more than one sheet per day.

The best thing to do is try different amounts until he seems satisfied without getting sick from eating too much iodine or salt.

Weeding Out the Answers to Your Frequently Asked Questions

Can Dogs Die From Seaweed?

Can seaweed kill dogs? Seaweed is a very popular ingredient in many types of dog treats, but it can also be dangerous to your dog if he eats too much.

Seaweed can cause a variety of problems for dogs, including dehydration, diarrhea, and vomiting. Contact your vet immediately if you think your dog has eaten too much seaweed. Your vet will likely recommend giving your dog some activated charcoal to absorb any remaining seaweed in your dog’s system.

Can Dogs’ Teeth Benefit From Seaweed?

The answer to this question is yes! Many types of seaweed are available for purchase at local pet stores or online retailers. It’s best to always consult your veterinarian before feeding your dog any new foods or supplements because some may not be safe for his particular breed or age group.

Your veterinarian will also be able to tell you whether or not there are any specific side effects associated with eating certain types of seaweed as well as if there are any other foods he should avoid while taking these supplements (e.g., chocolate).

Can Dogs Consume Packaged Seaweed?

Dried seaweed is typically used as an ingredient in dog treats, but it’s not something you should feed your pet regularly. It contains high levels of iodine and can cause an imbalance in your dog’s diet if they consume too much over time.

small dog running on the shore

The same goes for packaged seaweed snacks, which are made up primarily of sodium alginate and calcium sulfate. These ingredients are typically found in low-quality foods as well as some human medications (like laxatives), so they should also be avoided by dogs unless recommended by your vet first!

Speaking of packaged or canned goods, I have answered some common questions through a couple of posts, such as can dogs eat mackerel and can dogs eat goldfish snacks? Check out the linked articles in case you might have the same questions.

Can Dogs Consume Seaweed Found on the Beach?

Yes, but it’s not recommended. Some types of seaweed are edible, but some types are not. If you’re thinking about giving your dog some seaweed found on the beach, make sure you know which kind you have (or ask someone who knows). And even if it’s edible, it might not be good for your dog to eat.

If you want to feed your dog some seaweed, it’s best to do so under the supervision of a veterinarian. Seaweed can be toxic for dogs if they eat too much or if they eat it too quickly.

Can Dogs Eat Seaweed-topped Sushi?

The answer is yes, but you should consider the type of sushi you choose for your dog. It is important to know how to tell if a sushi roll contains raw fish before serving it to your dog.

In general, dogs should avoid raw fish as it contains parasites that may harm their health. Many types of sushi rolls are available at restaurants and grocery stores, so it is important to know what ingredients they contain before giving them to your dog.

Some types of raw fish contain parasites which can make them dangerous for dogs to eat since they can’t digest them properly due to their small stomachs and lack of teeth.

So it’s not just the seaweed; it’s the possible ingestion of raw fish by your pup. More on this in my post on can dogs eat raw fish.


Seaweed can be a nutritious treat for dogs, but some varieties are toxic, so it’s important to know what kind of seaweed you have and if it’s safe to give your dog.

Seaweed can be used in some recipes for our dogs and is a good way to hide pills in a meal. But we should be careful when given seaweed as the dog can’t process it very well.

Long story short: as long as you exercise caution, seaweed can be a safe, healthy addition to your dog’s diet. Be sure to keep seaweed out of reach of your dog, and remove any uneaten portions from his bowl immediately. Tune in for more articles on what we can feed our furry friends! Ciao!

Photo of author

Lovelia Horn

I’m a certified crazy dog mom, a physical therapist (for hoomans), writer, animal rescuer, and foster home provider. Together with my hubby Ryan, I’ve fostered and helped look for forever homes for over a hundred shelter dogs in the Southern Illinois area. I mostly work with Puppy Rescue 911, Inc., a certified animal rescue organization based out of Chester, IL (home of Popeye!)

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