package Animal;
use Moo;
has [qw(name gender)] => (is => 'ro');

package Pet;
use Moo::Role;
has [qw(treats pref)] => (is => 'ro');
sub play { sprintf "%s a %s", $_[0]->pref, @{$_[0]->treats}[rand@{$_[0]->treats}] }

package Dog;
use Moo; extends 'Animal'; with 'Pet';

package Cat;
use Moo; extends 'Animal'; with 'Pet';

package main;
my @pets = (
    Dog->new( name => 'Odie', gender => 'male', pref => 'chases', treats => [qw(ball bone doll)] ),
    Cat->new( name => 'Garfield', gender => 'male', pref => 'eats', treats => [qw(lasagna pookie blanket)] ),
);

printf "%s, being %s, %s.\n", $_->name, $_->gender, $_->play for @pets;