The Battle for Eyetooth by Frank Rodgers
Eyetooth, the secret last refuge of the vampires, is in the evil grip of Count Fibula. Only vegetarian vampire Count Muesli and his friends can stop Fibula's fiendish plot to return Eyetooth, and the world, to the bloodthirsty days of old. But Count Muesli has been banished and must return in secret if he is to fight Fibula and his cronies. Count Muesli can't do it alone. He needs the help of his human friends and of the oldest rebel vampires. It's risky and dangerous and the odds are against them but when they fight together, they triumph over the evil Count Fibula in a heart-stopping climax.