Great question — and honestly, it’s one more pet parents should ask before adding any new piece to the yard, porch, or patio. The short answer is: it depends on the bench. Some outdoor benches are made and finished with pet-safe materials, while others use preservatives, sealants, or paints that can be problematic if your dog or cat likes to lick, chew, or spend a lot of time lying on them.
If you’re looking at a wooden bench, the biggest thing to check is whether the wood has been pressure-treated. Older pressure-treated lumber was often treated with chromated copper arsenate, which contains arsenic. That’s a serious concern for pets that chew or paw at surfaces. CCA-treated wood for residential use was largely phased out years ago, but very old outdoor furniture or repurposed wood could still contain it. Modern pressure-treated wood is usually treated with ACQ or copper azole, which are less toxic, but still not something you want your pet ingesting in large amounts. Wood stained or sealed with strong solvent-based products can also release VOCs during application and curing, and some mildew-resistant finishes contain fungicides that aren’t pet-friendly.
That doesn’t mean you have to avoid wooden benches entirely. Solid, naturally rot-resistant woods like cedar, teak, or white oak can be a safer starting point, especially if they’re unfinished or finished with a natural, food-safe oil. If you want extra protection, look for water-based, low-VOC, or explicitly pet-safe sealers. Always let any finish fully cure before letting pets near it — curing can take days or even weeks depending on weather.
For the most pet-safe route, consider benches made from powder-coated metal, stainless steel, or recycled plastic lumber. These materials typically don’t need chemical wood treatments and are easy to wipe down. If a bench has cushions, check that the fabric is outdoor-rated and free of harsh flame retardants or stain-guard chemicals; pets often nap right on those surfaces.
If you already have a bench and you’re not sure how it was treated, contact the manufacturer and ask directly whether the materials and finishes are pet-safe. You can also place a washable pet blanket or mat over the seating area to reduce direct contact. Keep an eye on pets that chew — no outdoor furniture finish is really meant to be eaten.
One more thing: be careful with cleaners and wood polishes you use on the bench. Some furniture sprays contain ingredients that are safe for humans but not for pets that lick surfaces. Stick to mild soap and water, or a cleaner labeled pet-safe.
So, to answer your question plainly: yes, some outdoor benches are treated with chemicals that can be harmful to pets — especially older pressure-treated wood, solvent-based finishes, and certain weatherproofing treatments. But there are plenty of pet-safe alternatives and ways to make a bench safer. When in doubt, go with untreated or naturally rot-resistant wood, powder-coated metal, or recycled plastic, and always ask about finishes before you buy.