The problem is that RaceHorse is expecting its object to be a hash reference, but you're using code (Horse and Animal) that is creating an object based on a scalar reference.
Are you sure you're using the appropriate code examples?
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Jeff[japhy]Pinyan:
Perl,
regex,
and perlhacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;