dog = 55
cat = 12

##</code><code>##


my %hash = (

     'dog' => '5',
     'sheep' => '10',
     'cat' => '3',

  );

my %hash2 = (

      'dog' => '11',
      'budgie' => '1', 
      'cat' => '4',

  ); 

foreach (keys %hash2)    {


     if (exists $hash{$_})   {

       print "$_ exists";
  
    }

}