Short answer: it depends on the oil, the pet, and the room — not the format itself. A reed diffuser isn't inherently riskier than a candle or spray, but if you share your home with a cat especially, it's worth understanding why they're more sensitive than dogs before you place one.
Why Cats Are the Bigger Consideration
Cats' livers process certain compounds differently than dogs' or humans' do, which makes them more sensitive to concentrated essential oils — particularly tea tree, citrus (d-limonene), pine, cinnamon, clove, and wintergreen. This matters more with pure, undiluted essential oil blends than with fragrance oils formulated for ambient home use, and more in a small, poorly ventilated room than an open one.
Dogs are generally more tolerant, but "safe in general" doesn't mean "safe in any amount" — a diffuser in a small closed room a dog sleeps in every night is a different exposure level than one in a hallway they walk through.
How to Scent Your Home Responsibly With Pets Around
📌 Every Flair diffuser carries this same guidance right on the box — keep it away from kids and pets — because that's the responsible standard for any concentrated home fragrance, not a red flag specific to us. If anything, it's a sign of a brand that's upfront about what's actually in the bottle instead of slapping "pet-friendly" on packaging without backing it up.