I see where I went wrong. I read the above as bless $self, $class instead of bless $self, $breed.
In any case, I still think that if you want this to be a good tutorial on polymorphism, some of the subclasses should override bark. As it is, it doesn't take advantage of polymorphism.
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: () { :|:& };:
Note: All code is untested, unless otherwise stated
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