Gill, as a runner - joggers only go out in nice weather and wear far too many clothes - and dog owner, I can see both sides.
If you're running and a dog interferes with that, causing you to stop while the owner recalls it, it's inconvenient.. not because of the dog (unless dog phobic) but because your breathing rhythm will be out when you start up again. If you're running hard and you suddenly have to stop you can feel quite sick too, as your blood pools. And obviously stopping means you'll lose time if you're timing a run etc.
I just keep on runnng if a loose dog comes up to me; often the dog wants to run with you for a bit. And i make the owner do some work catching it

I don't understand why runners wave their arms about or make a scene - that's just encouraging the dog in my mind. Or those who stand rigid but look at the dog, durrr.
If I'm running near farms often the farm dog(s) will run near me and bark but once you're off their territory they stop, like an invisible barrier. I just say 'Hi Sam' and carry on.
There was a bad tempered westie I used to encounter on my runs which tried to bite my ankles.. I got fed up dancing out of its way, so I turned around and ran up to its owner and barked in her face. She looked like this

I said 'I'm just being friendly!'