Cats drool when happy because the positive and pleasurable stimulation they experience can cause a physiological response involving the release of endorphins, which can stimulate saliva production. This drooling is often accompanied by purring, kneading, and face rubbing. It is thought to be a sign of contentment and relaxation, sometimes linked to kittenhood behaviors like nursing, when cats would knead and rub against their mother to stimulate milk production. The drooling happens because their mouth muscles relax and salivary glands get triggered during these blissful moments. This behavior is completely normal in many cats and indicates they are feeling very relaxed and happy.
However, not all cats drool when happy, and if drooling is excessive or accompanied by signs of illness, a veterinary check may be needed to rule out issues like dental problems, nausea, or stress.
In summary, cats drool when happy as a natural, relaxed response linked to feelings of comfort and pleasure, often triggered by petting or cuddling.
