Can cats eat ketchup?
Not recommendedKetchup is not recommended for cats: it is salty and sugary, many recipes include onion powder, and cats are especially susceptible to Allium-related red-cell injury.
Reviewed by the Webvet Veterinarian Team · Last reviewed June 26, 2026
Why
Cats have no dietary requirement for added sugar, although they can metabolize glucose. The larger concern is onion or garlic in the exact recipe because cats are especially susceptible to oxidative red-cell damage from Allium species. The dog-like xylitol syndrome has not been reported in cats, but unknown sugar-free products still need a complete label check for other hazards.
Risks to watch for
- Onion and garlic powder can cause red blood cell damage and anemia
- Salt and sugar are a poor fit for a small carnivore's diet
- Vinegar and spices commonly cause vomiting or diarrhea
What to do if your cat ate ketchup
Check the exact label and contact your veterinarian with the product, estimated amount and time, your cat's weight and history, whether packaging was swallowed, and any symptoms.
Ketchup nutrition
- Calories
- ≈100 kcal / 100g
- Sugar
- ≈21.3g total sugars / 100g in one representative USDA entry
- Sodium
- ≈907mg / 100g in one representative USDA entry
Safe alternatives
More pantry & other for cats
Frequently asked questions
Can cats eat ketchup?
Ketchup is not recommended for cats: it is salty and sugary, many recipes include onion powder, and cats are especially susceptible to Allium-related red-cell injury.
What happens if a cat eats ketchup?
Cats have no dietary requirement for added sugar, although they can metabolize glucose. The larger concern is onion or garlic in the exact recipe because cats are especially susceptible to oxidative red-cell damage from Allium species. The dog-like xylitol syndrome has not been reported in cats, but unknown sugar-free products still need a complete label check for other hazards. Watch for: Onion and garlic powder can cause red blood cell damage and anemia; Salt and sugar are a poor fit for a small carnivore's diet; Vinegar and spices commonly cause vomiting or diarrhea.
What should I do if my cat ate ketchup?
Check the exact label and contact your veterinarian with the product, estimated amount and time, your cat's weight and history, whether packaging was swallowed, and any symptoms.
Sources
Reviewed by the Webvet Veterinarian Team
General guidance based on credible veterinary sources — not a diagnosis or a substitute for your veterinarian. If your pet ate something toxic or is unwell, contact your vet or a pet poison line right away.