I don't know whether this is a typo on your part, or a misprint in the book, but In think you will need to put parentheses instead of curly braces here:

my %hash = (   # note parenthesis open here
    Mouse => {Index => 0, Value => 'Jerry'},
    Cat   => {Index => 1, Value => 'Tom'},
    Dog   => {Index => 2, Value => 'Spike'}
    );  # note parenthesis close here
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The output then becomes:

HASH(0xfd578) {'Value'} <= Mouse 
HASH(0xfd494) {'Value'} <= Cat 
HASH(0x10e080) {'Value'} <= Dog
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Liz