I picked up 10 wk old kitten yesterday. Pet shop owner told me she had been flea treated (and wormed) and should be ok for 3 weeks, however if I see black specs when combing to give her flea tab and treat the house. Saw her scratching behind ears earlier, combed her and lots of black specs fell out. I have the flea tabs, but she wont take it out of my hand. Can I put it in her food bowl? She is on dried food. Also, I have some spray for the house (bought it just in case) should I treat the kitten then do the spray immediately or wait until the tablets have worked?