Related Clues:

• Baskervilles dog
• Pursue relentlessly
• Lassie, for one
• Bother persistently
• ''A --- of Flanders''
• Terrier or retriever
• Harass, in a way
• See 68-Across
• One may sit for a master
• Brittany, for one
• It's found in a pound
• Boxer, for one
• Borzoi, for one
• See 46-Down
• Jed Clampett's Duke