Anyone walking a dog using a lead - while riding a bike - seems to me to be asking for trouble
I know some dogs are very well trained and predictable but even very well trained dogs will sometimes do something unpredictable such as stopping - at which point you will loose control - and if someone is near you then you could hit them
To be totally controversial - no not helmets - not even what lube to use
I am fine with those retractable leads
I just have trouble with dog walkers that use them with no view of oncoming traffic (i.e. walkers, joggers, cyclists) and don;t react properly when they see someone
One person yesterday did the classic - dog on right, person on left
I ring my bell
person stays where he is and tries to reel the confused dog in across the path
If he had just walked across the path himself then we would have been fine
so - not the lead - the numpty on the end that isn't a dog