Possible Clues:

• Warning sign that canine ought to be stopped?
• Pain also leads to article about account given by hospital
• Two rings interrupting wielding of hatchet is cause of pain
• Pain caused by hatchet broken about middle of foot
• Canine ailment? Oh, the coat is mangy
• Cockney's trouble in Hampstead?
• Blow the whistle for a laugh on revolutionary that's a pain in the face
• Ooh, the cat is worried -- it could be a canine problem
• Dental problem
• Nipper playing up?