I would never, ever boo Dunnie!! As Mammulty says, we never boo anyone who scores, just a second or two of silence and then "Come on City, Come on City"
I will be cheering for Dunnie when his name is announced, when he comes onto the pitch to warm up and when he comes onto the pitch for the match.
After that I will concentrate on City's performance and at the end I will cheer him off the pitch.
Once a Blue, always a Blue for Dunnie.