When a dog gets something trapped in his mouth (wood fragment or plant matter), he drools. The offending object may be wedged between the teeth, often lying across the roof of the mouth, or embedded in the gum tissue. Dogs don't floss, so this is a common cause of drooling.

Why would a dog suddenly start drooling?

The most common cause of drooling is dental disease – if your dog has dental disease in their gum tissue, or problems with their teeth they often start to dribble. This is common with slowly developing dental issues like tartar build-up, but can also be seen with sudden changes.

What does a dog drooling mean?

Anything that prevents your dog from swallowing normally can lead to drool, as the saliva will build up until it drips from his mouth. ... Tartar buildup and irritation of the gums can also lead to drooling, as can an infection in the mouth. In addition, a foreign body can lead to slobbering.