Dogs: Creatures of Nature

Mouth and Tooth Disorders: Drooling, Reluctance to Chewing, Misaligned bite

Excessive Drooling
If your dog is showing sings of excessive drooling then it may be caused by a salivary cyst, a periodontal disease, tongue injury, or simply a foreign object. Salivary cysts look like large blisters that occur under the tongue. If your dog has periodontal disease then the cement that holds his teeth in place gets destroyed. Tongue wounds can occur from self infliction or by getting info fights with dogs.