I used your code to set ( i just added use strict and warnings) and mine to read and it worked fine

#!/usr/local/bin/perl -w
#
# this is a file i named set.cgi
#
#
use strict;
use CGI;
my $q = new CGI;

my $cookie_out = $q->cookie(-name=>"wolves", 
                         -value=>"cookieinfo",
                         -expires=>'+24h');

print $q->header(-cookie=>$cookie_out);

my $cookie_in = $q->cookie("wolves"); 

print $cookie_in;
[download]

#!/usr/local/bin/perl -w
#
# this is my code, i named it read.cgi
#
#
use CGI;
use strict;

print "Content-type:text/html\n\n";

my $q = new CGI;
my $cookie_in = $q->cookie('wolves');
print $cookie_in;
[download]

both pages displayed the word "cookieinfo", do you get something different?
-Robert