CautionSeafood
Updated:2026-09-29 · Food code:FOOD-FUN-0011
紫菜 配图

Laver (Nori)Pyropia yezoensis

Laver (Nori)

Pyropia yezoensis
Also known as:nori, laver seaweed
CatCaution

**Laver (nori) is likewise very high in iodine**, and a cat's small body tolerates little surplus, so regular or large amounts disturb thyroid function and **cats with thyroid disease must avoid it**; **seasoned nori snacks bring salt, sugar and oil** on top.

DogCaution

**Laver (nori) is also very high in iodine**, so a small amount can exceed a dog's needs, and long-term or large servings disturb thyroid function, especially in dogs already treated for a thyroid condition; **seasoned nori snacks bring salt, sugar and oil**.

What to do after ingestion

Feeding risk and emergency notice · Contact a veterinarian or an emergency animal hospital immediately; do not rely on this site alone
Symptoms

Vomiting, diarrhoea, poor appetite and lethargy; the salt in seasoned nori snacks may cause unusual thirst and frequent urination, and long-term excess iodine may be linked to thyroid problems.

What to do

Stop feeding and watch; **contact a vet immediately** for persistent vomiting, diarrhoea, lethargy or unusual thirst, or if a thyroid problem is suspected, and never induce vomiting or give human medicine at home.

Why it is risky

**Laver (nori) is likewise very high in iodine**, and a cat's small body tolerates little surplus, so regular or large amounts disturb thyroid function and **cats with thyroid disease must avoid it**; **seasoned nori snacks bring salt, sugar and oil** on top.

What to do after ingestion

Feeding risk and emergency notice · Contact a veterinarian or an emergency animal hospital immediately; do not rely on this site alone
Symptoms

Vomiting, diarrhoea, poor appetite and lethargy; the salt in seasoned nori snacks may also cause unusual thirst and frequent urination, and long-term excess iodine may be linked to thyroid problems.

What to do

Stop feeding and watch; **contact a vet immediately** for persistent vomiting, diarrhoea, lethargy or unusual thirst, or if a thyroid problem is suspected, and never induce vomiting or give human medicine at home.

Why it is risky

**Laver (nori) is also very high in iodine**, so a small amount can exceed a dog's needs, and long-term or large servings disturb thyroid function, especially in dogs already treated for a thyroid condition; **seasoned nori snacks bring salt, sugar and oil**.

Nutrition

Per 100 g, edible portion
Energy · kcal/100g
35
Protein
5.81 g
Fat
0.28 g
Carbohydrates
5.11 g
Dietary fiber
0.3 g
Water
85.03 g

Data source:USDA FoodData Central · SR Legacy · Accessed on:2026-09-28

Cat · Safe feeding conditions

Caution

No additional condition notes for this food

Clinical and veterinary sources

1
Merck Veterinary Manual
Toxicology — Food Hazards (Merck Veterinary Manual)
Accessed:2024-09-15View source ↗
2
WSAVA (World Small Animal Veterinary Association)
Global Nutrition Guidelines
Accessed:2024-10-20View source ↗
Why it is risky

**Laver (nori) is likewise very high in iodine**, and a cat's small body tolerates little surplus, so regular or large amounts disturb thyroid function and **cats with thyroid disease must avoid it**; **seasoned nori snacks bring salt, sugar and oil** on top.

Symptoms

Vomiting, diarrhoea, poor appetite and lethargy; the salt in seasoned nori snacks may cause unusual thirst and frequent urination, and long-term excess iodine may be linked to thyroid problems.

What to do

Stop feeding and watch; **contact a vet immediately** for persistent vomiting, diarrhoea, lethargy or unusual thirst, or if a thyroid problem is suspected, and never induce vomiting or give human medicine at home.

Notes

**Even plain, unseasoned sushi nori stays a tiny rare taste**; **never give cats seasoned nori sheets or nori-flavoured snacks**; cook it soft before chopping, and **never feed it for claimed iodine benefits**; complete cat food stays the main diet.

Dog · Safe feeding conditions

Caution

No additional condition notes for this food

Clinical and veterinary sources

1
Merck Veterinary Manual
Toxicology — Food Hazards (Merck Veterinary Manual)
Accessed:2024-09-15View source ↗
2
WSAVA (World Small Animal Veterinary Association)
Global Nutrition Guidelines
Accessed:2024-10-20View source ↗
Why it is risky

**Laver (nori) is also very high in iodine**, so a small amount can exceed a dog's needs, and long-term or large servings disturb thyroid function, especially in dogs already treated for a thyroid condition; **seasoned nori snacks bring salt, sugar and oil**.

Symptoms

Vomiting, diarrhoea, poor appetite and lethargy; the salt in seasoned nori snacks may also cause unusual thirst and frequent urination, and long-term excess iodine may be linked to thyroid problems.

What to do

Stop feeding and watch; **contact a vet immediately** for persistent vomiting, diarrhoea, lethargy or unusual thirst, or if a thyroid problem is suspected, and never induce vomiting or give human medicine at home.

Notes

**Plain sushi nori is unseasoned but still belongs in the tiny occasional category**; **never feed seasoned nori sheets, nori snacks or salty seaweed crisps**; soak it and cook it soft before chopping, and **never feed it for claimed iodine benefits**.

Disclaimer and individual health notes

This website is for reference only and does not replace a licensed veterinarian. If your pet has eaten a suspected toxin or shows symptoms, contact a veterinarian or an emergency animal hospital immediately.