Hi there..sounds like rather then bombing the house for fleas, your friend can buy a spray that interrupts the cycle of the flea maturing. She will still need to treat the cats but on her carpet, sofa etc pretty much everything she can not wash that the cats use,..she can spray that product and...
i would take him off that food for a while if you can, if it is making him ill it is not worth a nickel anyway..perhaps if he has urinary issues..(had to deal with blockage with my little guy last year) try the royal canin urinary SO. They make both wet and dry and all my cats love it but I...