Why don't you dress in a dog costume and him in a cat's and just have a toe to toe on Deansgate to sort it out.We didn't bet money. Usually the loser has to do something humiliating in public like coming to work dressed as a cat, etc. It doesn't bother me tbh but it's worth it to see him doing it because he really cares about how he's perceived.
It would be like a scene from Dom Joly' s Trigger Happy TV.
I might even come along to cheer you on