Last spring & summer my neighbors were feeding feral cats who had kittens, who had more kittens, etc. They were pissing under our deck & all over our property. The stench was bad. Mothballs really have a strong odor, so if you're going to use them in an area you use, utilize caution - to be honest, I'd never use them again. The repellant sprays aren't cheap & wash away when it rains so you have to reapply. We finally went to war with the neighbors. When they stopped feeding the feral cats they disappeared. There's nothing worse than people who are clueless/ rude where animals are concerned.