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
Regular marshmallows are not toxic but are pure sugar with no nutritional value and can contribute to obesity and dental problems. More dangerously, sugar-free marshmallows often contain xylitol, which is extremely toxic to dogs even in small amounts. Marshmallows are also a choking hazard due to their sticky, spongy texture. There is no reason to give marshmallows to dogs — if you want to offer a sweet treat, small pieces of safe fruit like blueberries or watermelon are much better options.
What You Should Know
Marshmallows should be kept well away from dogs. If your dog has eaten marshmallows, watch for symptoms such as vomiting, diarrhea, lethargy, or loss of appetite. In an emergency, contact your veterinarian or an animal poison helpline straight away.