I took my 2 year old leopard dog/ ridgeback to the vet becuase he wouldnt stop drooling, huge puddles and his whole front was soaked. he has no other symptoms, nothing stuck in his mouth didnt get in to anything, no trauma, and he is just as playful as ever. the vet can't figure it out and suggested really expensive neurological testing… has anyone expierenced this with there dog? What could it be?