I don't think Data::Dumper will do this for you, but this oughta do the trick:

my $hashref = { 'Blue' => 1, 'COW' => 3 };
print "$_\t$hashref->{$_}\n" for keys %$hashref;
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Those who know that they are profound strive for clarity. Those who
would like to seem profound to the crowd strive for obscurity.
            --Friedrich Nietzsche