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Dog Coughing More In Hot Weather

Summer can be hard on a small dog with a sensitive airway. You may notice the honking gets louder and more frequent on hot, sticky days, or after a walk that felt fine in the morning. Here is why heat matters, how to plan around it, and the warning signs that mean your dog needs help right away.

Heat And Humidity Are Known Triggers

VCA Animal Hospitals says the cough of tracheal collapse can worsen during hot or humid weather. Cornell University College of Veterinary Medicine lists heat and humidity among the things that can make coughing worse and suggests avoiding hot and humid environments. Embrace Pet Insurance says the same and suggests keeping your dog indoors with air conditioning during hot weather.

How Dogs Cool Off

People sweat to cool down. Dogs mostly cannot. VCA Animal Hospitals explains that dogs have only a small number of sweat glands, located in their footpads, and that panting is their main way of controlling body temperature. VCA also notes that dogs with a restricted airway are at even greater risk of heat stroke, giving flat-faced breeds as the example. Ask your vet whether your dog's airway puts them in a higher-risk group.

A Summer Plan For A Coughing Dog

• Walk early or late. Go out in the coolest part of the day and keep walks short and slow.
• Skip the hot pavement. Choose grass and shade when you can.
• Keep the house cool. Run the air conditioning or fans, and give your dog a cool room to rest in.
• Water everywhere. Keep fresh water inside, outside, and on outings. If your dog coughs after gulping, offer smaller amounts more often.
• Limit excitement on hot days. VCA Animal Hospitals notes that excited or heavily exercised dogs can be at risk even when the temperature and humidity do not seem high, especially in poorly ventilated spaces.
• Never leave your dog in a car. VCA says this is the most common cause of heat stroke, and a dog's temperature can rise very quickly, often within minutes.
• Use a harness. Keep neck pressure off the windpipe, especially when your dog is already breathing harder.

What About Humidifiers?

It can sound like a contradiction that humid heat makes coughing worse while some owners use a humidifier indoors. In a 2024 Seoul National University study of 110 small dogs, dogs managed without medicine were given advice on weight, temperature and humidity control, and removing irritants like tobacco smoke. One dog in that study also improved with home nebulization. Ask your vet what humidity and temperature make sense for your home.

Heat Stroke: Know The Signs

VCA Animal Hospitals says a body temperature over 103°F is abnormal, and that dogs with heat stroke can have fast breathing, dry or sticky gums, abnormal gum color, bruising in the gums, tiredness, confusion, and seizures.

Heat Or Something Else?

A cough that only flares in summer is a useful clue, but it is not a diagnosis. Embrace Pet Insurance lists heart disease, kennel cough, and laryngeal paralysis among the many causes of a lasting cough. VCA Animal Hospitals notes that heart disease must be ruled out and can be present at the same time as tracheal collapse. A phone video of a fit and a note of the weather that day can help your vet. See Honking Cough.

When To Get Help

If your dog's cough gets worse every summer, tell your vet before the hot months, not after. The plan may change with the seasons. If your dog has tracheal collapse and is struggling even with treatment, Find A Practice shows listed practices near you that say they treat it.