We are a home with six dogs. So it had been a lot to maintain the home with all the dog hair and odors. Since we have been using there is no longer a smell of a dog when you come into the house. It is really amazing how this air purifier is able to clean the air so well. We are very pleased with this product so far. Looking forward to checking out how well it did against all the dust we have had to deal with in an older home.