AIR purifiers and pet odors?

What air purifiers have you found to be best in dealing with pet odors in the home? We do not have air conditioning so most of our problem is related to stale air. Any suggestions?
I have horrible allergies and need to keep my windows closed most of the time. Also air fresheners will not help because I am pregnant and can’t stand the smell of them. :) I used them in the past but this is why I am now resorting to buying a high quality air purifier- can’t stand the smell of fresheners and candles.


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