Why Does A Cat Drool. The most important thing to do is to detect these problems early, because some of these can be quite serious. Cats may drool due to pain caused by broken teeth, dental disease, or exposure to toxic chemicals.
If this happens when you put them in the car to take them to the vet, try putting them in their carrier. If this occurs frequently (some days, several times in the same day), this indicates a problem that must be treated quickly. These behaviours tend to take cats back to their childhood.