Ours is a smoke free home. We have a blue parakeet (Allegra), a yellow/green parakeet (Mango), and a Maine Coon/tabby mix cat (Zeus). I am a self proclaimed clean freak however, and clean rather obsessively, as a mom to an 11 year old and a 9 year old. Our house is always kept clean, and does not have any pet related or other offensive odors. All of these treasures are kept away from our pets, in a separate room, in sealed storage containers. The only items exposed to our pets are ones that I am personally using for my own private use.
Any rituals needed for Custom Conjured, Custom Spellcast, or Custom Transfer items, and any rituals or operations needed to prepare any items for re-homing, are typically performed in my personal Sanctuary at my Altar, which is an area where the pets are not allowed.
With previously owned items, it is not feasible for me to know the complete allergen history of each and every one of the previous owners' homes. However, if ever I do have any information regarding matters of allergens, I will always openly share such information in the listing.