The Sun 21 used norman pins to recover very long tow wires after they are broken off from the towing junk. In PAS the dogs are far as I remember where not fitted with norman pins and they where never used on the Girl class, so usually we put a dog rope onto the hawser to control it and help recover the tow wire. I believe the older bigger tugs used the same method. If the dog was restricting movement it was paid out, and heaved in as required, it was a precaution against girting, also I have seen commercial tugs used the same method. The R class tugs had Norman pins and they where used, when the tug was on passage with long tows astern, also they had temporary gog eyes on poles for long multiple tows astern such as when towing the remote controlled target vessels to keep the two towing hawsers apart on the tow deck.