You both said it very well! I've never run across another dog on a portage and I've only heard a couple bark in my 15 or so trips.
Echo has been on 2 trips with my wife and I and was a great companion on my solo last fall. He will be with me on future solos. He was great the couple of times we met people on portages (sat and stayed on command) and has never made a peep (even when a dog passing by in another canoe was going balistic barking at him)
It's also the story of "one bad egg" can ruin it for all. If someone has one bad experience with a dog they think all dogs should be banned. Just like people on the messageboard have ranted about a loud group of kids and think kids shouldn't be in the bwca either. or 1 fisherman leaves a fish pile in a campsite so all fisherman do that. I could go on and on.
I think Echo enjoys our trips more than I do.