Teeth chattering of an Australian Shepherd?

It can be excitement or nervousness, sometimes male dogs will chatter their teeth when a female in heat is around. But it could also be a seizure disorder, According to "Dog Owner's Home Veterinary Handbook," sudden, inexplicable, short bouts of teeth chattering could be a sign of focal motor seizures, also called partial seizures. The dog stays conscious and only has one part of the body go into spasms, such as the lower jaw. If you noticed neurological problems take him to the vet