Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Ketchup is not outright toxic to dogs, but it is not a suitable food for them either. Standard ketchup is high in sugar and sodium, and often contains onion powder, garlic powder, and various spices — all of which are harmful to dogs. Even ketchup without these ingredients provides no nutritional benefit. The high sugar content can contribute to obesity and dental issues, while the sodium can be problematic for dogs with heart or kidney conditions. If your dog licks a small amount of ketchup off your plate, it is unlikely to cause serious harm. However, it should not be offered intentionally, and sugar-free ketchup may contain xylitol, which is extremely toxic to dogs.
What You Should Know
While ketchup is not outright toxic, there are important precautions to bear in mind before sharing it with your dog. Portion size matters, and certain preparations or varieties may be unsafe. If your dog has any existing health conditions, check with your vet first.