Its probably a little late now but I was worried about you applying the Frontline 'Spot On' so shortly after spraying the cat with Bob Martins, its never a good idea to use 2 different products without a reasonable time in between. You know its sometimes a good idea to check things out with your vet or any vet, you can get info from just phoning the receptionist only people have many different ideas of the correct thing to do. It is important to get a house spray as well as treating the cats otherwise you'll never actually get rid of the fleas permanently. Do you have a local PDSA? Ideal if you're on a low income and they have excellent vets. You can register up to 3 pets.