I love well behaved dogs. But what does well behaved mean to you?
To me, a dog does not approach me unless I invite it. I, in return, do not pet an unknown animal without asking the owner's permission.
I don't want a dog "begging" while I am eating or nosing through my gear. Never mind whizzing on my tent/stuff or pooping on the trail.
Teach your dog to go when you walk off trail to do your own thing or learn his/her rhythms so you can take the dog off trail for pooping.
I can't stand the trails here where people literally let their pets step off the trail to poop (right next to the trail!) and think they don't need to clean it up but I have to step over/around it!
A dog should not jump on you or "lean" on you too much (usually done out of insecurity, not talking about "the tired lean.").
And your dog should be leashed.