Dogs should not have marshmallows. Marshmallows contain high levels of sugar, gelatin, and sometimes the artificial sweetener xylitol, which is highly toxic to dogs. Even regular marshmallows without xylitol are unhealthy for dogs due to their sugar content, which can lead to pancreatitis, obesity, diabetes, and digestive upset. Additionally, marshmallows can pose choking hazards since they are sticky and can expand in the stomach or throat. If a dog consumes marshmallows, especially those with xylitol, immediate veterinary attention is required. In summary:

• Marshmallows have no nutritional value for dogs.
• Sugar and artificial sweeteners can cause severe health issues.
• Xylitol-containing marshmallows are highly toxic.
• Sticky texture can cause choking or digestive blockages.
• Occasional accidental small amounts might not cause critical harm but are best avoided entirely.

For dog treats, it is safer to use products specifically made for dogs or veterinarian-recommended healthy snacks.