My son is asthmatic and is mildly allergic to dog dander. We have a dog which could make another dog from all the hair he sheds, frogs and a turtle. If not kept up with, it gets funky. We have tried so many different air purifiers. Some would work briefly and kind of just flatline. THIS purifier is an absolute game changer. We put it in his room and it doesn't disturb him when he sleeps and it works like magic to keep the air a pure s possible!