I just read on another post about putting 1 plain generic aspirin per gallon of water (made fresh daily) to help meaties with their heart issues. Maybe you could give him aspirin water for several days while you're trying to heal him. Thank goodness Larry has you!
Thank goodness they have you as a neighbor! It seems as though you have taken the right approach with them, and they're willing to listen to your suggestions. Kudos to you for the compassion you have shown to both the chickens AND the neighbors, and for taking the time and effort to educate them...