Se nossos ancestrais se comportavam conforme nossos primos-irmãos evolutivos, provavelmente a profissão mais antiga do mundo é bem mais antiga do que se pensava.  Via BBC:

Chimpanzees exchange meat for sex

Share and share alike: a male chimp will give up his hard-earned catch for sex

Chimpanzees enter into “deals” whereby they exchange meat for sex, according to researchers.

Male chimps that are willing to share the proceeds of their hunting expeditions mate twice as often as their more selfish counterparts.

This is a long-term exchange, so males continue to share their catch with females when they are not fertile, copulating with them when they are.

The team describe their findings in the journal PLoS One.”

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Então fica assim:  o uso do termo “cachorra” é totalmente calunioso para com as canídeas.