With an inbreeding coefficient of 28.2% Cuckoo was bred in 1962 with 4 littermates and 3 full siblings, all carrying the Gotoground prefix but none earning a title. The two champions among her 44 paternal half siblings were the significant Eng. Ch. Nanfan Nimbus and Eng. Ch. Gotoground True Blue. She had no maternal half siblings. She produced 6 champions among her 32 total get from 8 breedings. She had larger litters for her day averaging 4 puppies per litter. Her most significant union was with Eng. Ch. Nanfan Thistle.