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Dwarfism in the Friesian horse breed. a A female dwarf next to two normal female Friesian horses. The dwarf has a height at the withers of 1.12 m; the horse in the middle has a height of 1.54 m, which is close to the minimum allowed by the breed standard (1.53 m); the horse on the right has a height of 1.66 m. b and c Photographic illustrations of the typical pectus excavatum phenotype in the Friesian dwarf of the right b and the left side c
