hmmm. Sounds like you are getting fleas from elsewhere. DE WILL kill all adults and just emerging fleas. Advantage kills fleas and provents them from breeding. Is there some other way the cats or you might be exposed to fleas??? Despite what you might hear garlic and yeast do NOT work.
It would be best to try and figure out just where the fleaas are coming from...Could you have raccoons or skunks or some other critter living under your home or nearby??

I'm guessing the DE isn't helping because of the rain. The vet said that the Advantage takes awhile to work through their system, too. (I didn't treat prior to last week when I noticed they got bugs). I am still finding one or two on my cats when I comb them. There might have been a little "user-error" with the product, too. My one cat used her back paw to scratch the medicine the second I applied it, distributing it across her fur. (I washed her paw as well as I could right after this so she wouldn't lick it). I have to wait 30 days to retreat at which time I'll make sure they don't touch it.

My one cat loves getting combed so I can get her thoroughly and the other I'm only able to get a few pass-throughs. I've got DE nestled into my carpets right now in case of emerging eggs. I haven't noticed any in the house and have been doing the vacuum-a-million-times ordeal.

Yes, I have wild animals around here. I had a woodchuck living under my front deck (cats are in the back). I haven't seen him in the last couple of weeks. I bought a trap to catch him but got distracted catching the stray cat and then the woodchuck disappeared. We also had an infestation of moles in the early part of the season (which was what lead me to get the DE to begin with). They've all been exterminated early season by the cats as far as I can tell. Wouldn't these still be dropping fleas in the kennel, though?

mazer - I just saw the woodchuck on the front lawn a couple of minutes ago! Do you think that's the culprit and if I get rid of her my fleas will go? I have flower beds all over my yard and in front of the kennel, maybe she's going into the back looking for food? Time to set the trap...!

okay - this is really funny you guys! I was comparing Advantage II prices at Petmeds and they had a recommendation to get Virbac yard Spray. So I clicked on it to read about it and would you look at benefit #1 - that's hysterical!!! Guess I should keep shopping - lol

What is Virbac Yard Spray?
Virbac Yard Spray is a convenient method for killing fleas and ticks in your yard. Simply attach the included sprayer to the end of a garden hose and you can cover up to 6,000 square feet. Virbac Yard Spray helps prevent re-infestations on your dog or cat when used with preventatives, such as Frontline Plus, and a home remedy, such as the Virbac Knockout Fogger (both sold separately.)
For: Yard pest infestations
Benefits:
*Kills fleas and ticks that infest your yard, and then your pet
* Eliminates deer ticks and other ticks that carry and transmit Lyme disease
* Safer than similar products
* Will not harm grass or foliage

How it works:
Esfenvalerate is a synthetic pyrethroid insecticide that kills a wide range of pests, including fleas and ticks. Its safer than many other formulations. That said, be sure not to apply directly to your pets or in ponds, as it is highly toxic with fish.

Here is a link that might be useful: 1800petmeds

What is DE?
Have you tried the frontline SPRAY? IMOP it works better then regular frontline if you already have fleas.It's a little pricy,but I can't find anything that works better.
We just sprayed some on our cat tonight and you could see the fleas dying right on him.

DE is Diatomaceous Earth, a natural powdered product. It's supposed to be effective and safe for pets/humans.

No, I haven't tried the Frontline Spray yet. It seems like the Advantage II has started taking effect. I was looking for something I could put down in my outside area that won't harm my pets. I checked on a cat breeder forum since they often have kennels but not getting any suggestions (other than skin-so-soft).

I've been trying to catch the woodchuck but she's not going after the bait.

Where can you buy the Diatomaceous Earth? I looked it up and it seems to be a good tool in killing fleas.
We have flea bombed,and are using frontline spray but I'm still seeing some.

I found mine at Agway, Julbean. You have to make sure you buy a bag that says it's food quality. The brand I found was "St. Gabriel Organics" and it had a big stamp that said "Pet Approved". They make the DE for pools and that's not the one you want - that kind contains chemicals.

Right after I vacuumed I applied it to my carpeting. Warning, it's pretty dusty. I sprinkled it on and then rubbed it down into the carpet with a stick I had and just let it sit. This way, if any eggs dropped then when they emerge they'll get cut. If you rub it in your house doesn't look a wreck. I also put some right onto my cats and they didn't even notice. Someone on another thread said it dried her dogs skin out so that's something to keep in mind. I've checked my pets and they looked okay.