Related Clues:

• 6-Down, for one
• Kennel club reject
• Mongrel canine
• Pursue relentlessly
• Lassie, for one
• Jeff's partner
• No purebred
• Bother persistently
• Jeff's cartoon comrade
• ''A --- of Flanders''
• Jeff's cohort
• Not Jeff, but his friend
• Jeff's comic partner
• Terrier or retriever
• Harass, in a way