What should I do if my dog suddenly drools a lot of thick saliva?

If a dog suddenly drools a lot of thick saliva, it may have eaten something strongly irritating. Give it some plain water to rinse its mouth and ease the symptoms. Mouth trauma, swollen gums, or mouth ulcers can also cause heavy drooling, so check the mouth carefully. If you find an injury, use an oral spray and anti-inflammatory medication.

If the drooling is accompanied by abnormal behavior, convulsions, or collapse, consider poisoning or brain injury, and take the dog to a veterinary hospital promptly for examination and treatment.