Burning frankincense incense around dogs is not recommended. While frankincense resin itself is not classified as a toxic substance for dogs, the smoke produced by burning any incense releases fine particulate matter that can irritate and damage a dog’s respiratory system. Dogs with existing breathing problems are especially vulnerable, and certain breeds face higher risks than others.
The Real Problem: Smoke, Not Frankincense
The distinction that matters here is between frankincense as a substance and frankincense as burning incense. Boswellia, the plant frankincense comes from, is actually used in some veterinary joint supplements. VCA Animal Hospitals notes that boswellia products can cause mild gastrointestinal upset like vomiting or diarrhea, and may slightly decrease blood clotting, but the plant itself isn’t considered poisonous to dogs.
The danger comes from combustion. When you light a stick of frankincense incense, it releases a cloud of fine particles known as PM2.5, along with volatile organic compounds and carbon monoxide. These particles are small enough to penetrate deep into lung tissue. A study published in the Journal of Veterinary Internal Medicine found that dogs with respiratory disease were significantly more likely to live in homes where incense was burned: 30% of dogs with respiratory problems had household incense exposure, compared to just 13% of healthy dogs. Dogs also have a far more sensitive sense of smell than humans, which means airborne irritants hit them harder.
Signs Your Dog Is Bothered by Incense
Dogs can’t tell you the smoke is bothering them, so you need to watch for physical cues. The most common signs of smoke irritation are respiratory: coughing, gagging, wheezing, rapid breathing, or standing with the neck stretched out as if straining for air. Eye irritation is also common. You might notice squinting, redness, watery eyes, or the third eyelid sliding up over the eye. In more serious cases involving significant smoke exposure, dogs may drool excessively, vomit, seem uncoordinated, or become unusually weak. These neurological signs point to carbon monoxide buildup and require immediate veterinary attention.
Many dogs won’t show dramatic symptoms right away. Lower-level, repeated exposure is the more realistic concern for most pet owners who burn incense regularly at home.
Which Dogs Are Most at Risk
Not all dogs face the same level of risk. Several factors make certain dogs more vulnerable to incense smoke:
- Flat-faced breeds like Pugs, Bulldogs, Boston Terriers, and Shih Tzus already have compromised airways due to their shortened skulls. Smoke exposure can easily trigger or worsen breathing difficulties in these dogs.
- Dogs with existing respiratory conditions such as asthma, allergies, or chronic bronchitis are significantly more sensitive. Research shows these dogs are more vulnerable to incense combustion than healthy dogs, regardless of how much smoke they’re actually exposed to.
- Puppies and senior dogs have less resilient respiratory systems. Age plays a meaningful role in how well a dog tolerates airborne irritants.
- Smaller dogs breathe in more particulate matter relative to their body weight, which may increase their risk. Body weight was identified as a key factor in incense-related respiratory outcomes.
Long-Term Exposure Adds Up
Occasional, brief incense burning in a well-ventilated room is very different from daily use in a closed space. The Journal of Veterinary Internal Medicine study found that when incense burning was combined with secondhand cigarette smoke in the same household, 14% of dogs with respiratory disease had that combined exposure, compared to 0% of healthy dogs. That’s a striking gap. While the researchers noted that incense alone didn’t show a statistically strong association with respiratory disease in dogs after adjusting for other variables, the pattern was clear enough to raise concern, especially for households that burn incense frequently.
Incense is a significant source of indoor particulate matter. Over time, chronic exposure to these particles can contribute to inflammation in the airways, even in dogs that seem fine in the short term.
What About the Chemicals in Frankincense Smoke
Frankincense oil contains natural compounds like alpha-pinene, linalool, and 1-octanol. When burned, these terpenes enter the air along with combustion byproducts. While some of these compounds have anti-inflammatory properties in laboratory settings, inhaling them as part of smoke is a completely different story than ingesting them in a controlled supplement form. The combustion process itself generates harmful particles regardless of what’s being burned.
Commercial frankincense incense sticks often contain additional ingredients beyond pure resin, including binding agents, fragrances, and synthetic additives. These can introduce their own irritants into the air. The aromatic plant materials and essential oils used to create scented incense can compound the respiratory effects of the smoke itself.
Safer Ways to Use Frankincense at Home
If you want to enjoy frankincense without putting your dog at risk, the simplest approach is to burn incense only in a room your dog doesn’t have access to, with windows open or a fan running. Keep the door closed and let the room air out before your dog re-enters.
Better yet, consider alternatives that skip combustion entirely. A diffuser with a small amount of frankincense essential oil produces far less particulate matter than burning a resin or stick. Even then, keep the diffuser in a room your dog can leave freely, since their nose is far more sensitive than yours. Some dogs will simply walk away from a scent they dislike, which is a clear signal to respect. Unscented candles, open windows, or plant-based room sprays used sparingly in ventilated areas are other options that avoid the particulate problem altogether.