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Limb morphology of domestic and wild canids
Fig. 7 from Wayne (1986), "Limb morphology of domestic and wild canids: The influence of development on morphologic change," Journal of Morphology 187(3):301-319. It shows an analysis of limb measurements from several species of domestic dogs (dots), other members of the genus Canis (labeled 1), fox-sized species (labeled 2-5) and other species: la) Canis lupus, the grey wolf; 6a) Speothos venaticus, the bushdog; 6b) Nyctereutes procyonoides, the raccoon dog; 6c) Atelocynus microtis, the short-eared dog; A) Chihuahua; B) Irish wolfhound.
It shows that dog limbs are much more varied than those of all other members of the family Canidae, including foxes, wolves, and coyotes.