Possible Clues:

• Persistence
• Doggedness
• Stick-to-it-iveness
• Determination for endless outdoor accommodation on area near Dublin, for instance
• Ability to stick to one below Jack in each urban centre
• Stick-to-itiveness
• Number a town that's owned by a bulldog
• That gets X over a town and won't let it go
• You'll catch up with a town by hanging on like this
• Bulldog's quality