Possible Clues:

• (and 15, 12) Meat tart past its sell-by date?
• Mature lamb
• It is sometimes dressed as lamb
• Mangy dog often outside for meat
• Dead, we are told, and can be eaten
• Dog being cooked to provide meat
• Dog about to get some meat
• Dog riding sheep
• Meat - goose cooking
• Shepherd's pie meat