I feel compelled to react. Extensible dog leads are not just extensible, they are also, more importantly, retractable! Dogs around obstacles (including other dogs, humans and bicycles on shared paths) should be on a short lead. I have a dog, frequently these days have a second on extended visit and I walk both at the same time with retractable leads. I also carry poo bags (and use them where appropriate, although I don't hunt dog poo in the brambles and nettles at night!). I keep them (dogs, not turds!) on a short lead when we meet people with or without dogs, bicycles, "trottinettes", electric or otherwise, pushchairs, deliveroo bags etc. I feel deeply aggreaved by dog owners that don't respect sensible practices around other people or dogs (one of our neighbours, who also happens to be an ex-colleague of my wife was actually attacked by another dog while walking hers on one of the paths that I regularly use; Inexcusable!)
I would also feel deeply aggreaved if a cyclist came at me from behind without warning on a shared path and expected me to suddenly disappear (but then the shared paths I use are pavements first and the law is quite clear that pedestrians have priority). This does not happen very often, perhaps the consequence of living in a part of the world with space for people. (Incidentally hte same co-operation is the norm in this part of the world when encountering mtbs on the trails in the woods, there aren't too many idiots around - or they're all riding souped-up scooters and mopeds around the tower blocks!)
On moving passive aids: I don't like wheel reflectors because I have a fear of things stuck in my spokes - but for being seen side on at night (like on a roundabout) they really do work - and they flash really well, provided that there are only one or at most two per wheel, more than that and they become continuous rather than flashing. For the price, (3-4€ per bike) fit and forget (until they fall off!)