Under an apartment building in Mexico City the remains of 12 dogs have been uncovered. Previously dog burials have been found accompanying human remains or as offerings but this is the first group of dogs to be buried together in one site. The remains have been dated between 1350 a 1520 A.D., during the Aztec empire. Research of the bones will be needed to determine the breeds of the dogs and the way in which they were killed. Further excavation will also be needed to attempt to build up context of the burial to try and explain why the dogs were buried there.
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To find out a little more on dog remains in the archaeological record read my page Archaeological Evidence for Dog Domestication.