Possible Clues:

• Pig's foot
• Harness racer
• Tango with cad, bit of a pig
• Sulky-puller
• After short time worthless person is seen as a bit of a pig
• Type of racehorse
• Horse close to perfect during comeback is backed
• Lowest part of cat, rat - and pig!
• Competitor in a harness
• Pig's foot - type of racing horse