My cats hate the Advantage stuff, too.  Presumably less than they'd hates fleas, but still.

Connie, do they have a feral trap, neuter and release program in your area?  Where I live, they will help you trap feral cats so they can be neutered.  And it's free, because it's not your cat.  It's a pet-population control thing. Ours is through Second Chance for Animal Welfare.  They are the same organization that does the low cost spay/neuter clinics for pets.

One goes into the house of eleven eleven times, but always comes out one. -River Tam