I'm sorry to hear that this has happened. All of my cats are indoor only so I used to think that I wouldn't ever need to use flea treatments on them. Well I was very wrong. California has very mild winters so fleas can live all year long. I also live in a condo complex so if my neighbors pet has fleas, then they can just jump onto the hallway carpet and get into my condo. I now use advantage year round on all of my cats. I've been buying the largest dog size and then I measure it out according to how much my cats weigh. One of my former vets recommended this to me to help save me money. I buy it online from entirelypets.com. They have many sales on it throughout the year. Ever since I've been using it, I've never had any more fleas. I hope that you'll be able to get rid of them quickly. Good luck.

I also wanted to mention to you that many fleas carry tapeworm so you also need to be on the lookout for this. If you ever see something on your pet or in their bedding that looks like rice, then it's probably tapeworm. Your pet would then need be treated for it. My cat Sky got them before I adopted him because he had been treated for fleas but not tapeworm. I later had to treat him with drontal pills and then retreat him a few weeks later. Hopefully the fleas you have don't carry tapeworm.