| 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 |
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.
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 — it can do more damage than the poison. What we will and won't tell you.
Can cats eat marshmallows? — Don't feed it to cats either.
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.
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. Some signs lag by a day — call, don't wait.
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.