Food safety
Can Dogs Eat Seaweed? Plain Nori Yes, Beach Seaweed No
Yes, dogs can eat a little plain seaweed, such as unseasoned nori sheets, but wild seaweed from the beach is a different matter. The AKC says processed seaweed without added salt or garlic is fine in moderation. Dried seaweed washed up on the shore can carry a lot of salt, swell in the stomach and cause a blockage. Seasoned seaweed snacks and sushi rolls are also off the list. Here is how to tell them apart.
By Matt GarnettUpdated November 13, 20264 min read2 sources
Why plain seaweed is safe in small amounts
Edible seaweeds such as nori, kelp and dulse carry minerals, including iodine, along with some fiber and protein. The AKC says plain, unseasoned seaweed is safe for dogs in moderation, and processed nori sheets with no added salt or garlic are the easiest form to share.
Seaweed is a food to keep small, though. It is rich in iodine, and the AKC notes that too much iodine can affect a dog's thyroid. A small piece now and then is very different from a daily handful or a high-dose kelp product.
The beach seaweed warning
Do not let your dog eat seaweed on the beach. The AKC warns that wild seaweed can carry a lot of salt, and that dried strands can swell in the stomach once they absorb water, causing vomiting, diarrhea, weakness and lethargy or a blockage. Long strands can also lodge in the intestines and may carry small animals or parasites.
Salt is the other risk at the shore. Pet Poison Helpline lists large amounts of seawater as a cause of salt poisoning, which can bring vomiting, diarrhea, stumbling, tremors and seizures. Bring fresh water for your dog to drink on a beach walk so it is less tempted to drink from the sea.
What to do if your dog ate beach seaweed
If your dog ate dried seaweed on the beach, call your vet straight away, even if your dog seems well. Dry seaweed can keep swelling for hours after it is eaten, and early advice gives your vet more options.
Watch for vomiting, a bloated or painful belly, straining, loss of appetite, heavy thirst, wobbliness or tremors. If you see any of those, go to the nearest vet. Pet Poison Helpline also warns never to use salt or salt water to make a dog vomit.
How to serve seaweed to your dog
Choose plain nori sheets or plain dried seaweed sold for people with no added salt, oil, soy sauce, sesame or garlic. Check the ingredients list before sharing. Tear the sheet into small pieces, about the size of a postage stamp for a large dog and smaller for a toy breed.
You can offer the pieces dry as a crunchy snack or crumble them over food. Do not give large dry clumps, which expand in the stomach, and avoid seaweed sold as a supplement unless your vet has suggested it.
For dogs that gulp anything new, a slow feeder bowl or a lick mat keeps portions small and eating slow.
How much seaweed by dog weight
Keep it to a taste. As a guide: under 20 lb, one or two small pieces of nori; 20 to 50 lb, a few pieces, about a quarter of a sheet; over 50 lb, up to half a sheet. A couple of times a week is plenty.
Because of the iodine, do not combine seaweed snacks with kelp-based supplements unless your vet agrees. Dogs with thyroid or kidney conditions should only have seaweed if their vet says it is suitable.
Seaweed snacks, sushi and puppies
Roasted seaweed snacks sold in packets are usually seasoned with salt, oil and sometimes garlic or soy sauce, which the AKC says to avoid. Sushi rolls combine seaweed with rice, raw fish, soy sauce and wasabi; raw fish is best avoided, and the rest is not suitable for dogs.
Puppies do not need seaweed. A small piece of plain nori is unlikely to cause harm, but their small size makes beach seaweed and salt water even more dangerous, so keep a puppy on a leash near the tideline.
Signs to watch for, and other snacks
Too much plain seaweed can cause vomiting or loose stool within a day. Call your vet the same day if your dog vomits repeatedly, has a swollen belly, strains to pass stool or seems lethargic after eating any seaweed.
If you want a crunchy low-calorie snack, try cucumber, carrot coins or green beans. For a beach day, a frozen chew toy and a collapsible water bowl are more useful than any seaweed.
This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.
Common questions
Can dogs eat nori?
Yes, plain nori sheets with no added salt, oil or seasoning are fine for dogs in small amounts. Tear them into small pieces and check the ingredients for garlic, soy sauce or sesame oil before sharing.
Is seaweed on the beach toxic to dogs?
It can make dogs very sick. Wild seaweed carries salt, and dried strands can swell in the stomach and cause a blockage. Call your vet if your dog ate seaweed on the beach, even if it seems fine.
Can dogs eat roasted seaweed snacks?
It is better not to. Packaged seaweed snacks are usually seasoned with salt, oil and sometimes garlic or soy sauce. A single piece is unlikely to cause harm, but plain nori is the safer choice.
Can dogs eat kelp?
Plain kelp is a seaweed and follows the same rules, but it is very high in iodine. Kelp supplements should only be used if your vet recommends them, because too much iodine can affect the thyroid.
Can dogs eat sushi?
No. Sushi often contains raw fish, rice seasoned with sugar and vinegar, soy sauce, wasabi and sometimes avocado or onion. A dog that ate a roll should be watched for stomach upset; call your vet if it vomits.
Sources we checked
This guide is general information, not veterinary advice. If your pet is unwell or injured, contact your veterinarian.
