There aren't any pet stores around my immediate area, so I'll look into the Feliway online. I have some sort of "calming spray" I bought last summer but I don't know if it does anything. Everyone calms down as soon as one of them is in the cage. I have problems keeping collars on my cats, but I'll try anything once. Havoc always gets his collar stuck in his mouth while grooming and Toby is the Houdini of collar escapes. I don't know if water would work, Toby's pretty hard-headed and stubborn. Havoc never attacks, he just stares and swishes and growls. He starts the argument but Toby always starts the catfight.