Haven't seen Rutger for a while, but I can confirm Gembo's strategy works..
Maximum Space man always replies if you say hello. Also has liked to discuss his dogs (positively). They always seem well under control as Greenroofer mentions, even with the terrier off the lead. I remember he went through a phase of doing the walk shirtless, but haven't seen doing that for a while. He also walks a long way! Often see him out by Heriot Watt, as well as into Meggetland.