I use Advantix on my dogs, and there are cats in the house, and there has never been a problem. Where did you see that it's not safe in a home with cats?

I got the box out to read the precautions, and the only thing I saw was: "If applied to a cat, or ingested by a cat which actively grooms a recently treated dog, this product may have serious harmful effects." That would stand to reason, but I don't see how anything else could be any more harmful than any of the other products.

It doesn't sound like Sunny is having an actual reaction, but more a case of just not liking it, if you're getting the same reaction with ear meds.