Alcohol, including beer, wine, liquor, and products containing it like mouthwash or raw bread dough, is poisonous to dogs due to their smaller size and inability to metabolize ethanol efficiently. It depresses the central nervous system, leading to symptoms like disorientation, weakness, vomiting, slowed breathing, low blood sugar, and hypothermia. Severe cases can cause seizures, coma, or death within hours. Factors like the dog's size, the alcohol type, and amount consumed influence severity puppies and small breeds are at higher risk. If a dog ingests alcohol, contact a vet or pet poison hotline immediately; do not wait for symptoms. Treatment may involve inducing vomiting, IV fluids, and supportive care. Prevention is key: keep all alcoholic substances securely stored away from pets.