Hi Janis, I don't know about this and cats, but will say one word of caution,   
   just in case. I remembered I did have one problem with one dog with advantix.   
   He was a pug and when I gave him the med, he all of a sudden came down with   
   very difficult breathing. I could not give him that med. It somehow affected   
   his breathing system as if it gave him asthma. The other dogs tolerated it   
   fine, it was just something that affected him for some reason. Allergy?? So   
   just be aware of that if You switch, watch them for an hour or so after   
   applying if You'd like.   
      
   Mike   
      
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