In addition to bathing the dog, you might look into a deodorizing product called X-O. If they haven’t changed the formula since I used to use it, I think you’ll find it works well with no noticeable scent of its own. Get the smallest size so you don’t lose much if it doesn’t work for you.

The X-O is for room freshening, not the dog!

Yes, bathe the dog. Regularly. Get rid of carpet if you have carpeting -- fibers hold odors, you'll never be able to completely get rid of odors trapped in carpet, only mask them. Also, check the dogs feet -- if they smell like Fritos, bacteria has gotten hold (this is a very common issue, doesn't mean the dog is dirty). You can use Ketohex wipes on paws to take care of that.

Air purifiers help too. Depending on the size and layout of your house, you might need more than one.

You didn't tell us how many dogs you have, more dogs = more smell.

Some dogs are just smellier than others -- kind of like some people have bad B.O. and others don't smell at all. I had a lab that always smelled, no matter what I did there was always dog odor in the house. My other two dogs? No problem.

Proper dog grooming does include bathing them but that needs to be done properly too. How often depends on dog type. Done too often & with incorrect shampoo types will create skin conditions for the poor dog & that can make a dog smell bad. Do you have a large, hairy, shedding type dog that’s very active outside or a small, non-shedding type that spends most of its day inside? Is your dog a breed that drools a lot? Think Basset Hound / St Bernard etc for that type. Do you brush your dog regularly & do you brush its teeth? Do you wash the dog bedding regularly? Do you have dry dog food in a bowl on the floor all day? Do you change water dishes daily?

The answers to all of these questions can be clues to why you might have a dog smell in the house.