If you are in the market for a good vacuum for pet allergy, you should check out those vacuum cleaners that are certified asthma & allergy friendly by the AAFA – Asthma and Allergy Foundation of America.
AAFA link:
https://www.aafa.org/certified-asthma-allergy-friendly/
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Asthma & allergy friendly vacuum list:
https://www.asthmaandallergyfriendly.com/USA/products_categories/vacuum-cleaners/