Dogs should not eat soy sauce because it contains a very high amount of sodium (salt), which is harmful to them. Even small quantities of soy sauce can exceed the safe sodium intake for dogs and pose serious health risks such as salt poisoning, dehydration, kidney damage, neurological issues, and in severe cases, death. Symptoms of soy sauce toxicity in dogs include excessive thirst, vomiting, diarrhea, lethargy, tremors, seizures, and loss of coordination. Dogs are much more sensitive to salt compared to humans, so they should avoid soy sauce entirely. Soy, as an ingredient itself, can be safe for dogs in moderation unless they have a soy allergy, but soy sauce is unsafe due to its salt content and potential additives that could also be toxic. If a dog accidentally ingests soy sauce, they should be given plenty of water and monitored closely while consulting a veterinarian immediately for proper care. In summary, do not feed soy sauce to dogs under any circumstances due to the risk of salt poisoning and related health complications.