class Dog {
    has Str $.name;

    method bark(Dog:D $dog: Int:D $x) {
        say $dog.^name;
        say $dog.name;
        say "bark" for 1..$x;       
    }
}

my $d = Dog.new(name => 'Rover');
$d.bark(3);
Dog.bark(3);

--output:--
Dog
Rover
bark
bark
bark
Invocant of method 'bark' must be an object instance of type 'Dog', not
a type object of type 'Dog'.  Did you forget a '.new'?
  in method bark at b.raku line 30
  in block <unit> at b.raku line 39