i dont mean to be offensive, I just have issues with people feeding neighbours cats - and I suspect if you had gone through 4 years of weight battles due to your neighbour feeding your cat while they were on a diet, plus seen them turn other peoples cats from a nice weight to being overweight and refusing to stop, you would have issues. Also, if your neighbours didn't know, you could cause health issues, so it isn't something I would recommend people do from that point of view