Possible Clues:

• Hanging limply — animated dog created by Tex Avery
• Like beagle ears
• Limp around on one's uppers in yard
• Cartoon dog — sagging
• Lacking spirit, poor turn back to get old penny found on yard
• Glum
• Inclined to sag
• It's boring 'olding 'oop slack
• Hanging head in disgrace, unknown have-nots turned up
• No longer rigid