Contact a Veterinarian Immediately
I cannot provide medical advice. Rock sulfur can be toxic to dogs and may cause gastrointestinal upset, vomiting, diarrhea, or more serious complications.
Next Steps
Call your vet right away and describe the type and amount consumed, plus any symptoms. Follow their instructions precisely. Keep toxic substances out of reach and train your dog to leave items alone.
Quick action can make a critical difference in a potentially life-threatening situation.