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Jackson and Groves regard the dog Canis familiaris as a taxonomic synonym for the wolf Canis lupus with them both equally ranked at the species level.They also disagree with Crowther, based on the overlap between dogs and dingoes in their morphology, in their ability to easily hybridize with each other, and that they show the signs of domestication by both having a cranium of smaller capacity than their progenitor, the wolf.

Domesticated dogs are clearly distinguishable from wolves by starch gel electrophoresis of red blood cell acid phosphatase.

In 2003, the ICZN ruled in its Opinion 2027 that the "name of a wild species..not invalid by virtue of being predated by the name based on a domestic form." Additionally, the ICZN placed the taxon Canis lupus as a conserved name on the official list under this opinion.

In the third edition of Mammal Species of the World published in 2005, the mammalogist W.

Two serious medical conditions particularly affecting dogs are pyometra, affecting unspayed females of all types and ages, and gastric dilatation volvulus (bloat), which affects the larger breeds or deep-chested dogs.

Both of these are acute conditions, and can kill rapidly.

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