Why
Soy sauce is very high in salt, so a large amount can cause extreme thirst, vomiting and diarrhea in dogs and cats, and very large amounts can cause salt poisoning with neurological signs. Cats and small dogs are affected by smaller amounts. Dishes seasoned with soy sauce often contain garlic, green onion or onion too. Even low-sodium soy sauce is still salty for pets.
How to give it / if eaten
Don't give soy sauce. A bit of food with a touch of soy sauce just needs plenty of water and watching. If your pet licked or drank more than a few spoonfuls, call your vet or an emergency clinic right away. Don't induce vomiting at home without a vet's instruction.
Watch for these signs
Extreme thirst, frequent urination, vomiting and diarrhea. Larger amounts can cause salt poisoning within hours: weakness, wobbliness, muscle tremors and seizures.
FAQ
My dog licked up spilled soy sauce.
The risk depends on the amount and size. Let your pet drink water, and call your vet right away if it was more than a few spoonfuls or your pet is a small dog or cat.
What about one piece of soy-braised meat?
One piece is usually fine, but the sauce may contain garlic or green onion. Offer water and watch; call your vet if several pieces were eaten.
General information only. Weight, age and health conditions change how a pet reacts, so ask your vet if you are worried.