Air Purifiers

I’m moving into a house with a dog, and I have allergies. However, they are not terrible and I take medicine. I’ve been searching for different ways to help my allergies. So far I have got change the floors from carpet to a hard surface, get a HEPA vacuum cleaner, get allergen pillow cases and mattress covers, replace the filters on the air conditioners, no extra clothe items in the room (including stuffed animals), get an ionic breeze air purifier.
As far as the dog goes I got give him a bath once a week, wipe him down with wet cloth daily, keep out of your bedroom, have good ventilation.
I’m open to a variety of suggestions; However, I cannot replace the dog. Besides he’s a really sweet lab. I’m open to using natural remedies, such as tea or hot peppers to specific cleaning techniques. SO PLEASE SHARE YOUR INPUT AND DIRECT ME TO RELEVANT WEBSITES!

I’m slightly allergic to maple and dog. But my allergy to dust and mites are so severe, that they were unable to be scaled because they were so high. I use an air purifier, enclosed my mattress, I take Calritin D, Zyrtec, vacuum using wearing a mask (we have an HEPA Hoover), and use a neti pot every day to relieve my symptoms, but it’s not enough. The symptoms bug me everyday and just get worse by the month. If I replace all my 20+ year old carpeting with hard wood flooring, will this make a drastic improvement in my allergies?

I am moving into my frat house in a few days and my roomate says the room is covered in thick dust, i need to buy an air purifier but i dont know which is best, i am looking to spend under 5. Also i need to know if there is any cleaning supplies or things i can use on the carpeting which is very dusty and dirty. Also the mattress in the room is dusty. Thanks for your help.