Start with the wax

The wax itself is where most candles differ, and it matters for pets.

Paraffin wax is a petroleum byproduct. When burned, it can release volatile organic compounds (VOCs) like benzene and toluene. Whether trace levels pose a serious health risk to humans is still debated — but pets, especially cats, spend far more time low to the ground where particulates settle, and their bodies process certain compounds differently than ours do.

Soy wax is plant-based and burns cleaner. It produces minimal soot and fewer combustion byproducts. It's not magic — burning anything produces some byproducts — but the difference between soy and paraffin is meaningful, especially for daily use in a home with pets.

All Mountain City Candles are made with 100% soy wax. No blends, no paraffin.

The fragrance question — and why it's more complicated

This is where it gets nuanced, and I'd rather be upfront with you than give you a blanket "we're totally safe" answer.

Essential oils vs. fragrance oils — these are not the same thing, and the distinction matters a lot for pet safety. Pure essential oils are highly concentrated plant extracts. Fragrance oils are synthetic or blended scent compounds designed for use in candles and melts. Fragrance oils are generally far less concentrated and far less likely to cause problems than essential oils used straight in a diffuser.

At Mountain City Candles, I don't add essential oils to my products. All scents are fragrance oils. They're also phthalate-free, Prop 65 compliant, and IFRA certified — meaning they meet international safety standards for fragrance ingredients.

The majority of pet toxicity reports involving candles come from essential oil diffusers — not from burning soy candles or using wax melts with fragrance oils. Those are very different products delivering very different concentrations into the air.

Dogs: generally the most tolerant

My two dogs have been around candles their entire lives — in my studio, in my home, at vendor events. I've never had an issue. Dogs have a strong sense of smell, but they're fairly resilient when it comes to candle and melt fragrances at normal use levels.

Common-sense rules still apply:

• ✔ Burn candles in ventilated spaces — don't seal a dog in a small room with a burning candle for hours.
• ✔ Keep candles and warmers out of reach. Curious dogs and open flames are a bad combination.
• ✔ Watch for signs of irritation — excessive sneezing, watery eyes, or restlessness. If your dog seems bothered, move them to another room and extinguish the candle.
• ✔ Don't let them eat the wax. Soy wax is non-toxic, but ingesting fragrance oils in quantity is not good for any animal.

Cats: more sensitive, especially to certain scents

Cats are more sensitive than dogs because their livers lack certain enzymes needed to metabolize specific compounds — particularly phenols, which are found in some essential oils. This makes them more vulnerable to fragrance-related irritation.

For most soy candles and melts used with good ventilation, cats do fine. But there are specific scents worth being careful with.

The same ventilation rules apply: don't burn any candle in a sealed room with a cat for extended periods, and watch for any signs of irritation.

Birds: a different situation entirely

Birds have extremely efficient respiratory systems — which is exactly what makes them so vulnerable to airborne compounds. Historically, miners used canaries in coal mines as an early warning system for toxic gases. That's not an accident.

Even low levels of VOCs, smoke, or fragrance compounds that are completely harmless to dogs and cats can be fatal to birds. This applies to candles, wax melts, cooking fumes, non-stick cookware, and air fresheners.

The bottom line

Soy candles and wax melts made with clean, phthalate-free fragrance oils are among the safest home fragrance options available — for you and your pets. They're meaningfully different from paraffin candles, essential oil diffusers, and synthetic air fresheners.

That said, no candle brand — including ours — can promise zero risk for every animal in every situation. What we can promise is that every candle and melt we make is poured with 100% soy wax, phthalate-free fragrance, no Prop 65 chemicals, and IFRA-compliant ingredients. We're not hiding anything.

Use common sense, keep the room ventilated, and if your pet seems bothered, trust that signal. They'll tell you.

• ✔ 100% soy wax — no paraffin, no petroleum byproducts
• ✔ Phthalate-free fragrance oils
• ✔ No Prop 65 chemicals
• ✔ IFRA-compliant ingredients
• ✔ Made in small batches in Frostburg, MD — not a factory floor