Updated 2026-08-07 · Source: ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets; ASPCA Animal Poison Control — Toxic and Non-Toxic Plants database · Free · No sign-up
No — ketchup should not be given to cats. If yours has already eaten some, call your vet.
If your cat may have eaten something harmful — or any part of a lily — call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 right now — don't wait for symptoms. A consultation fee may apply to the ASPCA hotline.
Verdict for cats
Don't feed
Severity
2 / 5 — Mild — usually stomach upset; watch them.
Safe amount
None
Category
Human snacks
Source
ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets; ASPCA Animal Poison Control — Toxic and Non-Toxic Plants database · reviewed 2026-08-07 · confidence: medium
Why
The onion and garlic powder in most tomato sauces are a real problem for cats, who are the more Allium-sensitive species. Skip it.
Signs to watch for if your cat has eaten ketchup
Vomiting, drooling or diarrhea
Weakness, tiredness or collapse
Pale or yellow gums
Red or brown urine
Fast breathing and a fast heart rate — signs can take 1–5 days to appear
Signs vary with the amount and with the individual pet, and some appear only after a day or more. Their absence does not mean your cat is in the clear — call rather than watch.
What to do now
Don't feed it. If your cat has already eaten some, call your vet or poison control with the amount and the timing and follow their advice.
Never induce vomiting and never give any medicine unless a vet tells you to. With some substances it causes more damage than the poison. This page tells you when to get help — it never tells you how to treat at home.
Safer alternatives for cats
A small piece of plain cooked chicken or turkey
Plain cooked fish, boneless and unseasoned
A vet-approved commercial cat treat, kept to under a tenth of daily calories
Cat grass grown indoors instead of houseplants
Fresh water — a fountain tempts many cats to drink more
Verdicts are transcribed from the cited veterinary sources, never inferred. Where a source establishes a finding for one species only, the other species is left null and the page says to ask your vet — a dog finding is never copied onto a cat.
This page is a reference, not veterinary advice or a diagnosis. CanMyPetEat is a reference, not veterinary advice or a diagnosis. It tells you when to get help — never how to treat at home. Never induce vomiting or give any medicine unless a vet tells you to. Individual pets vary and toxicity guidance changes; your vet and the ASPCA Animal Poison Control Center are the authority.
No — ketchup should not be given to cats. If yours has already eaten some, call your vet. The onion and garlic powder in most tomato sauces are a real problem for cats, who are the more Allium-sensitive species. Skip it.
What happens if a cat eats ketchup?
Watch for: Vomiting, drooling or diarrhea; Weakness, tiredness or collapse; Pale or yellow gums; Red or brown urine; Fast breathing and a fast heart rate — signs can take 1–5 days to appear. Signs can take hours or, for some poisons, a day or more to appear, so call your vet rather than waiting to see.
How much ketchup is dangerous for a cat?
The safe amount is none, as an occasional treat rather than a daily habit. Large amounts mainly cause stomach upset; if that doesn't settle within a day, call your vet.