The sea holds a bounty of treasures that can benefit the health of your cats. You may wonder, “can cats eat seaweed?” The answer is yes! When consumed in appropriate amounts, seaweeds and marine plants are safe and healthy for cats. This nutrient dense superfood of the sea provides a source of proteins, fibre, vitamins, trace minerals and essential fatty acids.
That said, not every seaweed product on the shelf is created equal, and portion size matters more than most cat owners realise. Below, we walk through the nutritional benefits, the best sources, and how much is actually safe to give your cat.
Health Benefits : High in Omega 3 Fatty Acids for Feline Skin & Coat
Next to fatty fish like salmon and sardines, sea plants and seaweeds are rich in EPA and DHA, two essential omega 3 fatty acids that are important for cat health. These fatty acids are important for maintaining a healthy heart and circulation, as well as promoting good skin and fur. As a nutritional supplement, seaweed for cats can also help to reduce inflammation and improve joint health
Iodine for Feline Thyroid Function
Seaweeds and marine plants are abundant in vitamins and minerals essential for feline health. For instance, seaweed is a good source of iodine, vital for regulating metabolism and supporting thyroid function in cats.
Elkhorn seamoss, a type of red seaweed and kelp, a type of brown seaweed are just a few examples of edible seaweeds for cats that are rich in iodine. Iodine helps with many functions including proper function of the thyroid gland. A diet that is low or deficient can lead to hyperthyroidism, an endocrine disease that is common in older cats.
Antioxidants to Support a Cat's Immune System
Marine plants and seaweeds are also a valuable source of antioxidants. Antioxidants help to support the immune system and protect cells from damage caused by free radicals produced in the body due to exposure to the environment, air pollutants and chemicals. Astaxanthin, a keto-carotenoid that possesses potent antioxidant properties, is found in marine algae such as the Hawaiian red algae and Haematococcus pluvialis, a microalgae.
Digestible Fiber and Amino Acids
Chlorella, a type of single-celled algae that grows in freshwater is not only a good source of chlorophyll, lycopene, beta-carotene and lutein, it provides your cat with nutritional fiber with helps in their digestive health. A diet with sufficient fiber can also aid in reducing inflammation and promotes healthy bowel movements.
Finally, seaweeds and marine plants are also a complete protein source with all nine essential amino acids required by cats, which makes it essential for building and repairing muscle tissues in felines. Spirulina and chlorella, two types of blue-green algae are particularly rich in amino acids, which are the building blocks of protein.
Can Cats Have Seaweed Snacks?
This is where a lot of cat owners get tripped up, because "seaweed" covers a lot of ground, from plain dried sheets to heavily seasoned snack packs.
Plain, unsalted nori (the kind used for sushi, with nothing added) is fine to share in small torn pieces now and then. Seasoned seaweed snacks are a different story: many are coated in salt, sesame oil, or seasoning blends that can include garlic or onion powder, both of which are toxic to cats. Before sharing a seaweed snack from your own pantry, it's worth a quick look at the ingredient label. If it lists more than just seaweed and a touch of oil, it's best left off the menu.
How Much Seaweed Is Safe for a Cat?
There is no official recommended dose of seaweed since it isn't meant to be a core part of a cat's diet, but a supplement. As a rough guide, a few small pieces (think a postage-stamp-sized amount) once or twice a week is plenty for most healthy adult cats. If you're introducing this superfood into meals for the first time, start with an even smaller taste and see how your cat handles it.
Do note that cats with thyroid conditions, kidney disease, or those on a prescription diet should only have seaweed with your vet's approval first, since the iodine content can interact with existing conditions.
A couple of things worth keeping in mind: dried seaweed can expand once it absorbs moisture, so avoid letting your cat swallow large pieces whole, and always choose food-grade seaweed rather than anything harvested from unknown waters, to avoid contamination.
Which Types of Seaweed Are Safe for Cats?
|
Type
|
Safe for cats?
|
Notes
|
|
Plain nori (unseasoned)
|
Yes, in small amounts
|
Most commonly available and easiest to portion
|
|
Kelp (plain, food-grade)
|
In very small amounts
|
Higher iodine; go sparingly
|
|
Wakame
|
Caution
|
Expands significantly when wet, cut very small, watch for choking risk
|
|
Seasoned/flavored seaweed snacks
|
No
|
Salt, oil, garlic/onion seasoning commonly unsafe
|
|
Seaweed from unknown/wild sources
|
No
|
Contamination risk
|
Can my cat eat seaweed every day?
It's not recommended. Seaweed should be an occasional treat (once or twice a week at most) due to its iodine and sodium content, not a daily addition.
What happens if a cat eats too much seaweed?
Overconsumption can lead to digestive upset, excess sodium or iodine intake, and, in dried form, a choking or blockage risk as it expands with moisture. Watch for vomiting, diarrhoea, or lethargy and contact your vet if these occur.
Can kittens eat seaweed?
It's best to avoid seaweed for kittens, whose digestive systems and thyroid function are still developing. Stick to a complete kitten diet and consult your vet before introducing anything new.
In conclusion, can cats eat seaweed? Absolutely. Seaweeds and marine plants are a great way to support feline health and well-being. Not only are they safe for cats to eat, but they are also a nutritional powerhouse that is rich in omega-3 fatty acids, vitamins and minerals, antioxidants, fibre, and protein.
If you are looking to add seaweeds and marine plants to your cat’s diet, consider adding kelp, nori, kombu, elkhorn seamoss, spirulina, or chlorella to their diet. Alternatively, at The Grateful Pet, our raw food for cats is boosted with superfoods, one of them being prebiotic elkhorn seamoss. It is fermented with active prebiotics which carry numerous benefits known to improve cardiovascular, liver and metabolic function by moderating healthy gut bacteria. You can choose from our variety of protein all of which are AAFCO complete and balanced.
References
- “Antioxidant Effects of Seaweeds and Their Active Compounds on Animal Health and Production – A Review” Taylor & Francis Online, 8 April 2022 https://www.tandfonline.com/doi/full/10.1080/01652176.2022.2061744
2. “Seaweeds for Animal Health” Innovative Veterinary Care, 20 September 2017, https://ivcjournal.com/seaweeds-animal-health/
3. “Red Algae.” International Journal of Current Advanced Research, 28 April 2022, https://journalijcar.org/sites/default/files/issue-files/13134-A-2022.pdf
4. Garlic and Onion (Allium spp) Toxicosis in Animals, Sept 2024
https://www.merckvetmanual.com/toxicology/food-hazards/garlic-and-onion-allium-spp-toxicosis-in-animal
The sea holds a bounty of treasures that can benefit the health of your cats. You may wonder, “can cats eat seaweed?” The answer is yes! When consumed in appropriate amounts, seaweeds and marine plants are safe and healthy for cats. This nutrient dense superfood of the sea provides a source of proteins, fibre, vitamins, trace minerals and essential fatty acids.
That said, not every seaweed product on the shelf is created equal, and portion size matters more than most cat owners realise. Below, we walk through the nutritional benefits, the best sources, and how much is actually safe to give your cat.
Health Benefits : High in Omega 3 Fatty Acids for Feline Skin & Coat
Next to fatty fish like salmon and sardines, sea plants and seaweeds are rich in EPA and DHA, two essential omega 3 fatty acids that are important for cat health. These fatty acids are important for maintaining a healthy heart and circulation, as well as promoting good skin and fur. As a nutritional supplement, seaweed for cats can also help to reduce inflammation and improve joint health
Iodine for Feline Thyroid Function
Seaweeds and marine plants are abundant in vitamins and minerals essential for feline health. For instance, seaweed is a good source of iodine, vital for regulating metabolism and supporting thyroid function in cats.
Elkhorn seamoss, a type of red seaweed and kelp, a type of brown seaweed are just a few examples of edible seaweeds for cats that are rich in iodine. Iodine helps with many functions including proper function of the thyroid gland. A diet that is low or deficient can lead to hyperthyroidism, an endocrine disease that is common in older cats.
Antioxidants to Support a Cat's Immune System
Marine plants and seaweeds are also a valuable source of antioxidants. Antioxidants help to support the immune system and protect cells from damage caused by free radicals produced in the body due to exposure to the environment, air pollutants and chemicals. Astaxanthin, a keto-carotenoid that possesses potent antioxidant properties, is found in marine algae such as the Hawaiian red algae and Haematococcus pluvialis, a microalgae.
Digestible Fiber and Amino Acids
Chlorella, a type of single-celled algae that grows in freshwater is not only a good source of chlorophyll, lycopene, beta-carotene and lutein, it provides your cat with nutritional fiber with helps in their digestive health. A diet with sufficient fiber can also aid in reducing inflammation and promotes healthy bowel movements.
Finally, seaweeds and marine plants are also a complete protein source with all nine essential amino acids required by cats, which makes it essential for building and repairing muscle tissues in felines. Spirulina and chlorella, two types of blue-green algae are particularly rich in amino acids, which are the building blocks of protein.
Can Cats Have Seaweed Snacks?
This is where a lot of cat owners get tripped up, because "seaweed" covers a lot of ground, from plain dried sheets to heavily seasoned snack packs.
Plain, unsalted nori (the kind used for sushi, with nothing added) is fine to share in small torn pieces now and then. Seasoned seaweed snacks are a different story: many are coated in salt, sesame oil, or seasoning blends that can include garlic or onion powder, both of which are toxic to cats. Before sharing a seaweed snack from your own pantry, it's worth a quick look at the ingredient label. If it lists more than just seaweed and a touch of oil, it's best left off the menu.
How Much Seaweed Is Safe for a Cat?
There is no official recommended dose of seaweed since it isn't meant to be a core part of a cat's diet, but a supplement. As a rough guide, a few small pieces (think a postage-stamp-sized amount) once or twice a week is plenty for most healthy adult cats. If you're introducing this superfood into meals for the first time, start with an even smaller taste and see how your cat handles it.
Do note that cats with thyroid conditions, kidney disease, or those on a prescription diet should only have seaweed with your vet's approval first, since the iodine content can interact with existing conditions.
A couple of things worth keeping in mind: dried seaweed can expand once it absorbs moisture, so avoid letting your cat swallow large pieces whole, and always choose food-grade seaweed rather than anything harvested from unknown waters, to avoid contamination.
Which Types of Seaweed Are Safe for Cats?
Type
Safe for cats?
Notes
Plain nori (unseasoned)
Yes, in small amounts
Most commonly available and easiest to portion
Kelp (plain, food-grade)
In very small amounts
Higher iodine; go sparingly
Wakame
Caution
Expands significantly when wet, cut very small, watch for choking risk
Seasoned/flavored seaweed snacks
No
Salt, oil, garlic/onion seasoning commonly unsafe
Seaweed from unknown/wild sources
No
Contamination risk
Can my cat eat seaweed every day?
It's not recommended. Seaweed should be an occasional treat (once or twice a week at most) due to its iodine and sodium content, not a daily addition.
What happens if a cat eats too much seaweed?
Overconsumption can lead to digestive upset, excess sodium or iodine intake, and, in dried form, a choking or blockage risk as it expands with moisture. Watch for vomiting, diarrhoea, or lethargy and contact your vet if these occur.
Can kittens eat seaweed?
It's best to avoid seaweed for kittens, whose digestive systems and thyroid function are still developing. Stick to a complete kitten diet and consult your vet before introducing anything new.
In conclusion, can cats eat seaweed? Absolutely. Seaweeds and marine plants are a great way to support feline health and well-being. Not only are they safe for cats to eat, but they are also a nutritional powerhouse that is rich in omega-3 fatty acids, vitamins and minerals, antioxidants, fibre, and protein.
If you are looking to add seaweeds and marine plants to your cat’s diet, consider adding kelp, nori, kombu, elkhorn seamoss, spirulina, or chlorella to their diet. Alternatively, at The Grateful Pet, our raw food for cats is boosted with superfoods, one of them being prebiotic elkhorn seamoss. It is fermented with active prebiotics which carry numerous benefits known to improve cardiovascular, liver and metabolic function by moderating healthy gut bacteria. You can choose from our variety of protein all of which are AAFCO complete and balanced.
References
2. “Seaweeds for Animal Health” Innovative Veterinary Care, 20 September 2017, https://ivcjournal.com/seaweeds-animal-health/
3. “Red Algae.” International Journal of Current Advanced Research, 28 April 2022, https://journalijcar.org/sites/default/files/issue-files/13134-A-2022.pdf
4. Garlic and Onion (Allium spp) Toxicosis in Animals, Sept 2024
https://www.merckvetmanual.com/toxicology/food-hazards/garlic-and-onion-allium-spp-toxicosis-in-animal