ノーザンダンサー
Kitten's Joy is inbred 3S × 5D to Northern Dancer, meaning Northern Dancer appears in the 3rd generation of the sire's side of the pedigree and in the 5th generation of the dam's side. He is also inbred 5S × 4D to Hail to Reason and 4S × 5D to Tom Fool.