CautionGrains & Nuts
Updated:2026-09-28 · Food code:FOOD-GRN-0011
亚麻籽 配图

FlaxseedLinum usitatissimum

Flaxseed

Linum usitatissimum
Also known as:flax seeds, linseed
CatCaution

The **cyanogenic glycosides** in flaxseed are a safety issue for cats too, especially raw seed or large amounts; cats are carnivores with no need for flaxseed, and its high fibre easily causes loose stools and bloating.

DogCaution

Flaxseed contains **cyanogenic glycosides**, so raw seeds or large amounts carry a cyanide-poisoning risk; it is also fairly oily and high in fibre, and too much causes loose stools, bloating and diarrhoea.

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

Loose stools, diarrhoea, bloating, vomiting, reduced appetite; cyanide poisoning causes rapid breathing, lethargy, weakness and possibly seizures and needs urgent care.

What to do

Contact a vet immediately after a large amount of raw flaxseed or if rapid breathing, lethargy or weakness appears.

Why it is risky

The **cyanogenic glycosides** in flaxseed are a safety issue for cats too, especially raw seed or large amounts; cats are carnivores with no need for flaxseed, and its high fibre easily causes loose stools and bloating.

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

Loose stools, diarrhoea, bloating, vomiting, reduced appetite; cyanide poisoning can bring rapid breathing, abnormal gum colour, lethargy, weakness and even seizures, which is an emergency.

What to do

Contact a vet immediately after a large amount of raw flaxseed or if rapid breathing, lethargy or weakness appears; never induce vomiting at home.

Why it is risky

Flaxseed contains **cyanogenic glycosides**, so raw seeds or large amounts carry a cyanide-poisoning risk; it is also fairly oily and high in fibre, and too much causes loose stools, bloating and diarrhoea.

Nutrition

Per 100 g, edible portion
Energy · kcal/100g
534
Protein
18.29 g
Fat
42.16 g
Carbohydrates
28.88 g
Dietary fiber
27.3 g
Water
6.96 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

The **cyanogenic glycosides** in flaxseed are a safety issue for cats too, especially raw seed or large amounts; cats are carnivores with no need for flaxseed, and its high fibre easily causes loose stools and bloating.

Symptoms

Loose stools, diarrhoea, bloating, vomiting, reduced appetite; cyanide poisoning causes rapid breathing, lethargy, weakness and possibly seizures and needs urgent care.

What to do

Contact a vet immediately after a large amount of raw flaxseed or if rapid breathing, lethargy or weakness appears.

Notes

At most a little **freshly ground** seed now and then, never in place of the main diet; whole seeds pass undigested and ground seed turns rancid quickly, so keep it sealed and chilled; do not expect coat or laxative benefits, and see a vet for those problems.

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

Flaxseed contains **cyanogenic glycosides**, so raw seeds or large amounts carry a cyanide-poisoning risk; it is also fairly oily and high in fibre, and too much causes loose stools, bloating and diarrhoea.

Symptoms

Loose stools, diarrhoea, bloating, vomiting, reduced appetite; cyanide poisoning can bring rapid breathing, abnormal gum colour, lethargy, weakness and even seizures, which is an emergency.

What to do

Contact a vet immediately after a large amount of raw flaxseed or if rapid breathing, lethargy or weakness appears; never induce vomiting at home.

Notes

Keep it small and **freshly ground**: whole seeds pass through largely undigested, while ground seed is more available but also turns rancid quickly, so store it sealed and chilled; flaxseed does not treat coat or bowel problems, so see a vet instead.

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.