- Extremely high in salt
- Within hours
- Affects: Brain & kidneys (sodium)
Why this verdict for cats
Soy sauce is loaded with salt and is dangerous for small cats. Never feed it.
Warning signs to watch for
- Excessive thirst
- Vomiting
⚠ If your cat ate soy sauce
Act immediately — don't wait for symptoms.
- Call your vet or a pet poison helpline right away.
- Note how much was eaten and when.
- Do not induce vomiting unless a professional tells you to.
Soy sauce is the saltiest thing in most kitchens by a wide margin, and it reaches pets through shared takeaway, a licked plate or a spilled dipping bowl. Salt poisoning is rare but genuinely dangerous, and soy sauce is one of the few household foods concentrated enough to cause it.
How much is safe?
A single tablespoon contains roughly 900 to 1,000 mg of sodium. Salt toxicity in dogs becomes a concern around 2 to 3 grams of salt per kg of body weight, so a small dog lapping a dipping bowl can approach a meaningful dose quickly. Most soy sauces also contain garlic or onion powder, which adds a second, entirely separate toxicity. Low-sodium versions are less severe but not a green light.
What happens if a cat eats too much?
Excess sodium first causes intense thirst and vomiting, then draws water out of brain cells as the body tries to balance itself. That produces wobbliness, disorientation, tremors, and in severe cases seizures and coma. Critically, an affected pet must have free access to water — restricting it makes things worse — but rapid correction is also dangerous, which is why this needs veterinary management rather than home treatment.
⚠ What to do if your cat ate soy sauce
Provide fresh water and call your vet or a poison line immediately (ASPCA 888-426-4435 · Pet Poison Helpline 855-764-7661) with your pet's weight and how much was consumed. Do not withhold water and do not try to force large amounts either. Sodium levels must be brought down slowly under supervision, because correcting them too fast causes brain swelling of its own.
⚠️ Worried your pet got into this?
Frequently asked questions
My dog licked a plate with a little soy sauce — is that dangerous?
A trace on a plate is usually fine for a medium or large dog, but call if the dog is small, if a bowl was drunk, or if there is heavy drinking, vomiting or wobbliness.
What other foods carry salt poisoning risk?
Seawater, homemade play dough, table salt itself, stock cubes, cured meats and some ice-melting products are the usual causes.
More pantry & snack foods for cats
By the CanMyPet Editorial Team · Reviewed against ASPCA Animal Poison Control, the American Kennel Club (AKC) and Pet Poison Helpline · Last updated July 31, 2026.
Sources
- ASPCA — People Foods to Avoid Feeding Your Pets
- American Kennel Club — Dog Nutrition
- Pet Poison Helpline — Poison List