Hello! I would suggest putting more air purifiers in the room. There are special air purifiers for pet owners. This will work perfectly in conjunction with regular general cleaning and washing the dogs. Such air purifiers have reinforced filters, as well as increased sensors of sensitivity to wool and dust in the air. Corgi lives in my apartment. True, she is only half a year. But for now, even my allergy-friendly friends can visit to our home.
When I bought an air purifier for myself, I read similar reviews and chose an acceptable ratio of price, quality and number of stars for the product. perhaps if you are interested in my advice, then this will help you:
https://www.homeair.org/best-air-purifier-for-pets-reviews/
https://homeairguides.com/how-air-purifiers/pets/best-air-purifier-for-pets-dander-and-hair/
https://houseweather.org/best-air-purifier-for-pets/
https://breathequality.com/best-air-purifiers-for-pets/
The selection is wide, as you can see! I could not decide on a purchase for about a month 😄
This is one of my tips. But I agree with the comment above that if there is a mark that there is a dog in the house, then guests should not have disappointments on this subject