Updated 2026-08-07 · Source: ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets; VCA Animal Hospitals — pet health library · Free · No sign-up
No — marshmallows should not be given to dogs. If yours has already eaten some, call your vet.
If your dog may have eaten something harmful, 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 dogs
Don't feed
Severity
3 / 5 — Risky — more than a taste can cause real illness.
Safe amount
None
Category
Sweets
Source
ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets; VCA Animal Hospitals — pet health library · reviewed 2026-08-07 · confidence: medium
Why
A plain sugar marshmallow is not toxic but is pure sugar and a genuine choking hazard — soft, sticky and the wrong shape. Sugar-free marshmallows are the real danger: they can contain xylitol, which is toxic to dogs.
Signs to watch for if your dog has eaten marshmallows
Gagging, retching or pawing at the mouth
Difficulty breathing or swallowing
Repeated vomiting, especially bringing up food or water
No appetite, a painful belly, straining to pass stool, or no stool at all
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 dog is in the clear — call rather than watch.
What to do now
Don't feed it. If your dog 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 dogs
Plain baby carrots or carrot sticks
Plain cooked chicken breast — no skin, no bones, no seasoning
A few blueberries or a slice of apple with the core removed
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 — marshmallows should not be given to dogs. If yours has already eaten some, call your vet. A plain sugar marshmallow is not toxic but is pure sugar and a genuine choking hazard — soft, sticky and the wrong shape. Sugar-free marshmallows are the real danger: they can contain xylitol, which is toxic to dogs.
What happens if a dog eats marshmallows?
Watch for: Gagging, retching or pawing at the mouth; Difficulty breathing or swallowing; Repeated vomiting, especially bringing up food or water; No appetite, a painful belly, straining to pass stool, or no stool at all. Signs can take hours or, for some poisons, a day or more to appear, so call your vet rather than waiting to see.
How many marshmallows are dangerous for a dog?
More than a taste can cause real illness, and the risk rises with the amount and with a smaller pet. The safe amount is none — if your dog has had more, call your vet.