I could hardly believe my eyes when I found this on bookstore shelves back in 1978. My two great interests combined: Sherlock Holmes and Dracula!
HOLMES AMONG THE UNDEAD...
A mysterious schooner runs aground in an English harbor. Its cargo os fifty boxes of earth; its only living passenger, a black dog. The captain's body is lashed to the wheel––lifeless, drained of blood. Soon, a rash of bizarre nocturnal crimes terrifies London. This, plainly, is the word of Count Dracula. And juts as plainly, it is a case for Sherlock Holmes. Lovers of the Holmes stories will find their hero here in a new role––avenger in a realm where pale corpses, rising from their graves, go forth by night to feast on blood...
Title: Sherlock Holmes vs. Dracula or The Adventure of the Sanguinary Count
Author: Loren D. Estleman