I just found this website in my reading list. You might find it useful. It covers a lot of what your already doing but it might give you some different ideas to try.
Care for Reactive Dogs
I have found a similar thing with Scott & Scout. Confident dogs passing us are more likely to cause my two to react, especially ones that look straight at us if we haven't enough distance inbetween, than calm, quiet dogs who have no interest in us at all which we can pass no problem. In fact sometimes if we stop to speak to the owner of the calm dog Scott will whinge a little bit like he wants to make friends with the dog. Not the human though. To make friends with a human my dogs need at least half an hour to work out that the human isn't a monster and the human has to ignore them no prolonged eye contact, definitely no touching. They will then love that human.I think he has trouble reading subtle cues.....causing a fear/aggressive response to minor things like confident dogs, barking or walking ahead of the handler.
I noticed this afternoon that two dogs that we see regularly left us plenty of space. ....I saw their owner talking this morning with the owner of a dog that he's lunged before so I assume that word is spreading. No hostility so he must understand that shamas is reactive not vicious
Unfortunately we sometimes meet owners of, usually, little dogs on extendable leads who let them wander all over wherever they want rather than just keeping the dog by them while they pass. Sometimes S&S cope ok with it, sometimes it dawns on the owner usually when my dogs start sounding like the Hound of the Baskervilles and they quickly reel the dog in and sometimes they carry on oblivious.It's actually really funny....the coffee tray is of higher value to Shamas than any treat that I can offer. Yesterday he carried a "bowl" of water home.....with water in it for the first few blocks! I love that because as the water spills into his mouth, I know he is hydrated.I love that he carries stuff! No way would Quinn carry Timbits...those are her favourite treat! She can hardly walk if she knows there’s one in my pocket!
Yes, yes, yes. This. Exactly.Sometimes I feel like small dog owners don't train, they manage....just toss a leash on and off we go. Its not like the little guy can pull you over or do damage if its bouncing over the sidewalk.
I know it's probably difficult for Bob to manage in a wheelchair but if he could try to distract Tiko if he sees you and Shamas it may help.