It sounds like it is perfectly normal then to give Rocky a bath every two weeks or so. His hair gets so soft after a bath! I will start using conditioner though, he does mat a little (probably the puppy fur) but not too bad, I try to brush him everyday but he seems more interested in biting the brush so grooming is not as effective as it could be!
I think I will book him for his first haircut soon - although I will miss his dark puppy fur - it looks like he will have a lot of grey!