INSIDE: Most of this page has covered how to treat your pet to keep pests off him. If you have fleas inside your house, it's "too late". Keeping pests off him will help eliminate the "carrier" but won't cure the underlying problem. BTW, when treating your dog, don't forget the cat. Fleas won't be as noticeable on her, but she can still carry them. Besides, it will make your Cocker feel better to see the cat get a bath. There's that shared-suffering bonding kind of thing going on.
A few years ago, there was a huge growth in organic exterminators that hit the market. They come into your house and spray a "safe spray", and give the house a treatment that will kill fleas, guaranteed. If you have birds, or any other pet, take them out of the house. Birds are especially sensitive to sprays and dusts... why do you think they used canaries in mines to warn of gas? Even if a 100% safe guarantee is given, why be sorry? Invite in the exterminators, and you'll be happy with the results, but take the pets with you. They usually charge around $100-300.
I'll give away a secret here. Some of the recent "flea begone" treatments, applied by professionals, ARE safe. The best known flea killer lasts for weeks and is completely safe for your kids and pets. It can be applied around children and pets, but get them out of the house to keep them from under foot. I'm sure you'll agree that this secret is worth $25, so I'll wait until you've E-mailed in your pledge. After all, the exterminator is going to charge your far more, right?
OK, I'm sure the check is in the mail.
This mystic secret is borax. What? Borax? You mean I sent in 25 bucks for borax? Stick with me here. Remember, flea eggs and larvae live in your carpets and furniture for weeks before they reach "flea" stage. This is their weakness. If you can kill them in this stage, there won't be any biters, and the biters are also the breeders. Break the cycle, and you can protect your home. Pick yourself up a cheap box of 20 Mule Team borax. Dump it into a bowl and break up the lumps, and sprinkle it over your carpets. Move the furniture and sprinkle it there. Wash your bedding. Wash the dog's bedding. Sprinkle more borax on the couch, chairs, and get some sprinkled under the cushions. Work it into the carpet using a good whisk broom. Then vacuum everything, and throw away the bag. (Flea eggs can hatch in your vacuum bag.) Chances are the borax will kill fleas in the bag, but why take a chance? Borax comes from valleys like Death Valley. It's terribly dry, and it will suck the moisture out of those little vermin.
OK, you've killed the eggs. If you have patience, the borax will kill most of the blood suckers as well. But hey, we are Americans, the land of instant gratification. Who are we to spit on the founding principals of our fore fathers? We want those vermin gone today, by gawd! Now is the time to take decisive action.
While your significant other is vacuuming up the last remains of the borax, run out and pick up a few packets of bug bombs. Figure one bomb will kill 500 sq. ft of house. Look at your home's layout. If there are any restrictions add in an additional bomb. Place them on paper, covering the floor for several feet around. Those Sunday papers come in handy for something at long last. Plan your escape route. With a good plan, you should be able to hold your breath while you set off the bombs, moving from one to another without breathing any fumes.
Before the actual detonation, tape shut your cabinets, and protect open food containers. They say these things are safe but throw away anything that can't be sealed tight. If you don't want to tape the cupboards shut, wash everything inside after the "smoke" has cleared. I know people who wash everything cloth in the house after an application. Personally, I settle for washing bedding, covering the beds and hoping for the best.
Preparation takes 2 or 3 hours, which is best done the night before the big bomb. Remove all your pets and loved ones, apply the papers, and begin the big bombing. With careful planning, this becomes a memorable event, like the time you survived the big flood, and something the kids will talk about for years to come. Dad goes back into the house, risking life and limb, and sets of the "big 'ens", seeing how long he can hold his breath. No sense in taking chances.
Several hours later, return to the house. With proper planning, you have a fan set up near the door, pointing towards a convenient opening. A few quick breaths, and you can rush indoors, open a couple windows, turn on the fan, and exit without breathing. Another quick rush to open the back door giving a decent cross breeze. This is a big event for your loved ones. Your spouse and kids will be impressed at your willingness to risk your life for their safety... or at least, your Cocker will be amused by your antics. Now is the time to return, slightly red of face, with bugged eyes, and spend some quality time with your loved ones. It should be safe to enter in about an hour. Proceed with caution, sniffing for scents of "killer" pesticide still lingering.
Now you have the fun of untaping packages and cabinets, washing dishes and counters, cleaning up papers and empty spray containers, and all the tasks of returning your house to normal. I've been through this procedure 3 or 4 times, but it was with my pet birds... before I learned how to control moths that came from their foodstuff. BTW, Amazons are not as impressed by these antics as are Cocker Spaniels.