Related Clues:

• Be hard on the nose
• It might be a clue
• It stinks
• It may hang around
• Dog attractor
• Notable ammonia attribute
• Be a real stinker
• Make a stink
• What carbon monoxide lacks
• Nose-wrinkler in the fridge, say
• Foot issue
• Identifier, to a dog
• Wafting thing
• Tracking dog's clue
• Landfill emanation