How do I get rid of fleas for good?

I assume you've done this already but if not, start with a DEEP clean, and of your entire house - not just the couch or anywhere the dog goes (but ESPECIALLY those places). Get a strong vacuum and get in ALLLLL the nooks and crannies to pick up any eggs/larva that might be hiding there. Then wash EVERYTHING--the carpets, the upholstry, the couch covers, all your blankets, even things you think the fleas aren't in--with HOT water and soap. Steam your carpets. Dry your laundry on high heat. Get those buggers out of there. If you're using a flea treatment for your dog you shouldn't really need to resort to insecticide, but it's an option if things are severe enough. But if they're coming in the house on your dog you may need to chase them out of your yard. You can usually do this just by mowing regularly (and makking sure to hit shady hidden spots) and scatter cedar chips in any shady spots where your dog likes to hang out because fleas hate the smell.

I highly recommend taking your pet to the vet if you suspect fleas in the home. That's always the first step. The next step is to wash all of the pet's bedding and make sure you're using high heat for at least an hour on a dry cycle to get rid of any eggs or larva that might still be in there. Vacuum your home frequently, as well.

Make sure you're using the right flea medication for your dog's breed and size first to kill all live fleas and eggs. Then, use a flea comb to remove the fleas and eggs from their fur. If you don't do the treatment first, the flea just jumps off the comb and lands somewhere else, so combing alone won't be effective.

Are you sure the fleas are coming for your dog? We had a flea problem a few years back (we don't even have a pet!) and I eventually realized they were coming in on mice :C Make sure you don't have any issues with rodest/other animals that might bring fleas in.

Even if you miss a few eggs or larva here or there when you clean the fleas won't survive if they don't have anything to feed off of. They'll enter their cocoon stage but they won't come out if there's no host for them to feed from like your dog, so if your house is spick and span and your dog has been thoroughly flea treated, any leftover fleas won't have much hope of survival

I have the same problem