why does my cat drool when i pet him?

When a cat drools during petting, it's frequently a sign of extreme contentment and relaxation. This behavior typically originates from kittenhood, where nursing kittens knead their mother while suckling, stimulating milk flow and often causing them to drool slightly. As adults, some cats associate the pleasure of petting with this early comfort, leading to a similar drooling response when they are exceptionally happy and relaxed. It's a positive indicator that your cat feels safe and loved.

However, drooling can also be a symptom of underlying health issues. Dental disease is a common culprit, affecting a significant portion of adult cats. Pain or inflammation from conditions like gingivitis, periodontitis, or tooth resorption can cause excessive salivation. Nausea, gastrointestinal upset, or the ingestion of irritating substances can also trigger drooling. Less commonly, oral injuries, foreign bodies lodged in the mouth, or certain systemic illnesses may manifest with increased salivation.

Warning: While often benign, persistent, excessive, or sudden onset drooling, especially if accompanied by other symptoms like loss of appetite, lethargy, bad breath, or pawing at the mouth, warrants a veterinary examination. Your veterinarian can rule out medical problems and ensure your cat's well-being.