Are Candles Toxic to Dogs? What Every Owner Must Know

About a year ago I got home from walking Riley around the neighborhood after a long Sunday reset — and if you've had one of those days, you know exactly the feeling. The laundry's done, the floors are clean, the counters are dusted, the meals are prepped. You're tired in the best possible way and the place feels incredible.

To cap the night off I lit a candle, put on Netflix, and settled in with my best bud to wind down before the week ahead. There really is no better feeling — a freshly cleaned home, a good candle burning, and your dog's head resting in your arm on the couch. It's one of the most relaxed states you can find yourself in.

So there I am. Riley's head is on my arm. The candle is burning. The room smells great. And then a thought crept in that I couldn't shake.

Is this actually good for him?

The fragrance was strong — noticeably strong. And I realized I had no idea what was in it. What kind of chemicals go into making a candle smell like that? I grabbed my phone to find out.

Turns out most candles are made with paraffin wax and synthetic fragrance oils — two things that release harmful compounds into the air when burned. Not great for you. Potentially worse for your dog, who spends their whole day breathing at nose level, closer to the ground than you'll ever be.

I couldn't unknow it. And I couldn't keep lighting candles in a room where Riley was sleeping without doing something about it.

That's where Riley's Supply Co. started. And it's what this article is about.

YOUR DOG'S NOSE IS NOT LIKE YOURS

Before we get into what's actually in most candles, it helps to understand what your dog is experiencing every time you light one.

A dog's sense of smell is roughly 100,000 times more powerful than a human's. That number is hard to process meaningfully — so here's a way to think about it. When you light a candle and notice a pleasant scent drifting across the room, your dog is experiencing something closer to having their face held directly over the source. Every compound released into the air hits them at a completely different intensity than it hits you.

Beyond the nose, dogs face additional vulnerabilities that most of us never think about. Their smaller lung capacity makes them more susceptible to airborne irritants. What represents safe exposure for a 150-pound human may genuinely overwhelm a 15-pound terrier.

And here's the part that really got me when I started digging into this. When a candle burns it releases microscopic fragrance particles into the air. Your dog inhales those particles — but they also land on their fur. Every time your dog grooms themselves after sitting in a room where a candle has been burning, they're ingesting trace amounts of whatever was in that candle. The exposure isn't just respiratory. It's happening on the couch, on the floor, every single time they lick their paw.

None of this means you need to throw out every candle in the house. It means the ingredients in those candles matter more for your dog than they do for you.

THE PROBLEM WITH MOST CANDLES

Walk into any big box store and pick up a candle. Turn it over. If it lists ingredients at all — and many don't — you'll likely see paraffin wax, fragrance, and maybe a dye listed somewhere on the label. Three words that tell you almost nothing.

Here's what's actually behind those three words.

Paraffin Wax

Paraffin is a petroleum byproduct — it's what's left over after crude oil is refined into gasoline and diesel. When you burn it, the combustion process releases benzene, toluene, and formaldehyde into the air. Those are the same compounds found in diesel exhaust.

When I learned this I immediately thought about Riley. About the fact that he spends roughly twenty hours a day in our home. About the fact that his nose is six inches from the floor. About every candle I'd lit without a second thought over the years.

For a dog who breathes closer to the ground and spends most of their life indoors, consistent paraffin exposure isn't a trivial concern. It's chronic, low-level indoor air pollution — and your dog is catching the full brunt of it.

Synthetic Fragrance

The word "fragrance" on a candle label is doing an enormous amount of heavy lifting. In the United States fragrance formulas are considered trade secrets — which means companies are not legally required to disclose what's actually in them. That single word can represent dozens of individual chemical compounds, none of which appear on the label.

Among the most concerning are phthalates — chemical compounds used to help fragrance last longer and throw further. Phthalates are endocrine disruptors, meaning they interfere with hormone function in both humans and animals. They've been linked to hormonal issues across a range of studies. And they're in a significant number of mainstream candles, including many from brands you've probably heard of.

If a candle just says "fragrance" — that's not transparency. That's a placeholder for something you're not being told.

Certain Essential Oils

This one surprised me most when I started researching. Natural doesn't automatically mean safe — especially for dogs.

The following essential oils are consistently flagged by veterinary resources as problematic for dogs: tea tree, peppermint, wintergreen, pine, ylang ylang, cinnamon, clove, eucalyptus, pennyroyal, and sweet birch.

Many candles marketed as "natural" or "aromatherapy" use these exact oils. A candle that smells like a spa to you might contain eucalyptus and peppermint — two of the most frequently flagged ingredients in veterinary toxicology literature. The word "natural" on a candle label means almost nothing without knowing which natural ingredients are actually in it.

SIGNS YOUR DOG MAY BE REACTING TO CANDLE FRAGRANCE

Some dogs are more sensitive than others. Riley, for whatever reason, has always been pretty unbothered. But I've heard from plenty of dog owners whose pets showed clear signs of discomfort from candles they'd been burning for years without connecting the dots.

Watch for any of these after lighting a candle near your dog:

• Sneezing repeatedly or rubbing their face
• Watery or irritated eyes
• Coughing or wheezing
• Unusual lethargy or quietness
• Leaving the room and not coming back
• Excessive drooling or signs of nausea

That last one deserves its own moment. Dogs are remarkably good at removing themselves from things that bother them. If your dog consistently disappears when you light a particular candle — they're communicating something. It's worth listening to.

If your dog shows any signs of distress after a candle is lit — coughing, sneezing, rubbing their face, struggling to breathe — put the candle out immediately and ventilate the space. If symptoms persist or seem serious, call your veterinarian.

WHAT I DID ABOUT IT

After that Sunday night research spiral I couldn't unknow what I'd found. And I couldn't keep lighting candles in a home where Riley was sleeping without doing something about it.

So I started making my own.

The goal was simple — a candle I could light without a second thought. One where I knew exactly what was in it, why every ingredient was there, and could say with confidence that it was made with Riley in mind.

That meant starting with coconut-soy wax instead of paraffin — one of the cleanest burning natural waxes available, with none of the petroleum byproducts that make paraffin a problem in the first place.

It meant using phthalate-free fragrance — because if I couldn't tell you exactly what was creating that scent, it had no business being in my home.

It meant an unbleached cotton wick — steady, quiet, and free from the chemical treatments found in lower quality wicks.

And it meant no synthetic dyes — because colorants in a candle serve no purpose except aesthetics, and aesthetics aren't worth the trade-off.

That's Riley's Supply Co. The whole brand started on a couch on a Sunday night with a dog's head on my arm and a question I couldn't let go of.

A NOTE ON VENTILATION

Even the cleanest candle in the world benefits from good airflow. Extended burns in a closed room will gradually build up fragrance concentration — and even with the best ingredients, that's worth managing.

The practical guidance is simple. Burn candles in rooms with some airflow. Crack a window when you can. Don't burn for more than four hours at a stretch. And never leave a candle burning unattended in a room with your dog — not because of the ingredients, but because dogs are curious, unpredictable, and a knocked candle is a serious hazard regardless of what's in it.

THE BOTTOM LINE

Candles are not inherently dangerous for dogs. Paraffin wax, undisclosed synthetic fragrance, and certain essential oils are dangerous for dogs.

That distinction matters more than it might seem. You don't have to give up candles. You just have to care about what's in them.

When I couldn't find a candle I felt genuinely good about lighting around Riley — one where I actually knew what was in it and why every ingredient was there — I decided to make one. That's the whole story of Riley's Supply Co. in one sentence.

Every candle we make starts with the same question that crept into my head on that couch a year ago. Is this actually good for him? Coconut-soy wax instead of paraffin. Phthalate-free fragrance. Unbleached cotton wick. No synthetic dyes. No ingredients we can't account for and stand behind.

Not because it makes a good marketing story. Because Riley deserves better than what most candles are offering — and so does your dog.

If your dog has shown any unusual symptoms after candle exposure, contact your veterinarian. For emergency situations involving potential toxin ingestion, the ASPCA Animal Poison Control Center is available at 1-888-426-4435.

The Good Dog Journal is Riley's Supply Co.'s resource for dog-conscious home owners. Everything we write starts with the same question our products do — is this actually good for the dog?