Does anyone use a pet air purifier?

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I'm debating getting one, but so far a lot of reviews for a few have said that if their dog's fur touched the unit it let out a shock/zap. I have 5 dogs so I can't imagine it being a simple zap with my pets. If you have fur pets + use one, please let me know what brand, price, where you bought it, and  how long it's been in use so far!