
I also wonder if chlorophyl tablets might not help.
This has a useful deodorising action, and sherleys used to sell them for use on bitches in season and for other body odors.
You can also get capsules in health shops as a dietary supplement. The tablets used to be used in colostomy bags, and it was the main ingredient in amplex tablets years ago.
I found the deodorising tablets by sherleys and the heatlh food shop capsules useful when I had bitches in season, and for a certain older dog who thought poo eating a delicacy. :D
It is also the main ingredient in those expensive dental chews called greenies.
If something like an internal, or even an external deodorant might help, would be wortyh a try.
Try bitch spray for external use before walks. Of course some of the reason for the interest may be his ultra submissive behaviour too :( as it was in a large Springer whose life was made a misery.
He could only enjoy meeting other dogs in the controlled environment of the dog training club, as off lead he was just too frightened and would run away.