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The dog breeds were separated into eight breed groups according to the cladogram, Ancient and spitz breeds: 1, Toy dogs: 2, Spaniels, scent hounds, and poodles: 3, Working dogs: 4, Small terriers: 5, Sight hounds and herding dogs: 6, Retrievers: 7, Mastiff-like dogs: 8. a vs b, p < 0.05; c vs d, p < 0.05; e vs f, p < 0.05; g vs h, p < 0.05.
