How does wildfire smoke affect dogs on walks?

Dogs breathing smoky air can develop coughing, mild wheezing, red or watery eyes, and unusual tiredness, symptoms that closely mirror how smoke exposure affects people and reflect genuine irritation to the airways and eyes rather than a purely aesthetic discomfort. Some dogs also show reduced appetite or general lethargy during periods of heavy smoke, likely related to the combined effect of poor air quality and any accompanying heat from nearby fire activity.

Flat-faced breeds, already working harder to move air through shortened airways, and dogs with existing heart or respiratory conditions are particularly vulnerable to smoke exposure, similar to how these groups face elevated risk in heat. Puppies and senior dogs also tend to be more sensitive to poor air quality than a fit, healthy adult dog of an unaffected breed.

Checking a local air quality index reading before heading outside gives a more objective measure than simply looking at visible haze, since smoke density and actual harmful particle levels do not always correlate perfectly with how far you can see. Many weather apps now include this reading specifically, and treating a poor or hazardous rating for people as an equally valid reason to limit a dog's outdoor time makes sense given the similar respiratory risks involved.

On days with poor air quality, keeping outdoor time brief and limited to toilet needs, avoiding vigorous exercise that increases breathing rate and smoke intake, and shifting to indoor games and puzzles for the bulk of a dog's activity all reduce meaningful exposure while still meeting basic needs.