Are dog and cat breeds like human races?

Breeding can only occur within a species. All humans, regardless of race, can breed with one another because we are the same species. Different breeds of dogs and cats look and act so differently. Is this just physical variation based on the origins of different digs and cats? I ask because interbreeding can... show more Breeding can only occur within a species.
All humans, regardless of race, can breed with one another because we are the same species.
Different breeds of dogs and cats look and act so differently. Is this just physical variation based on the origins of different digs and cats? I ask because interbreeding can occur between two types of dogs.
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