I find it quite interesting that so many "avowed cyclists" here fail to see the parallels between MUP users and roadway users, and fail to offer the same courtesy to MUP users in front of them that they expect from motorists overtaking those same cyclists on the roadways.
Folks, it comes down to this... you, approaching another human (with a dog or not) have the responsibility to pass safely. You have the full picture before you. You have the ability to moderate your speed for the conditions AHEAD. Please do so.
Overtaking traffic, in every situation, has the responsibility to assess the situation AHEAD and respond accordingly.