There are examples in the good old documentation:

How do I process an entire hash?

Access and Printing of a HASH OF HASHES

In my opinion, Dumper output looks a little better if you pass it a reference to a hash, rather than the hash itself: 

print Dumper(\%hash);

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In reply to Re: Need help looping through hash by toolic
in thread Need help looping through HoH by ewhitt

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