I posted on this forum a number of times pictures and comments of my 2 Rhodesian Ridgebacks. It was funny, when we were on the boat (52' Cockpit Motoryacht) both dogs were very happy. As soon as I started the engines the female found a place to go to sleep. Our male got very nervous and paced and shook. My wife had to hold him which was a challenge as he weighed 90 lbs. Things improve when we bought him a Thunder Shirt. You might look into one if he remains nervous. And Mike....he was probably only nervous cuz he heard you were cutting his nuts off. Makes any guy a bit gun shy.
Shawn
Shawn