That Ruby code is awfully sweet. I'm not sure how to replicate it, since I bet both objects are still technically Dog objects, and yet they have different methods. It's cool, though. Perhaps Perl 6 will allow that.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;