Coughing in dogs and cats: when to investigate

A cough is a forced, noisy exhalation that serves to clear the airways. For the vet it is not enough to know that the animal coughs: what matters is what the cough is like, because different features point to different causes. A precise description, ideally with a short video, is worth more than many words and often shortens the path to the cause.

• Sound: dry and hacking, or wet and gurgling, or loud and honking.
• Timing: after exertion, at night, when the animal lies down, after drinking or eating.
• Frequency: isolated episodes or repeated bouts one after another.
• What follows it: a final retch, the bringing up of foam or mucus, or nothing.
• How long it has lasted and whether it is worsening or improving over time.
• What accompanies it: shortness of breath, tiredness, poor appetite, runny nose, apparent fever.

One important difference frames the whole reasoning: in dogs a cough is a common symptom with many possible causes, while in cats it is a less frequent event and almost always worth attention. What looks like a cough in a cat is often in reality a breathing effort deserving prompt assessment, because cats tend to hide illness and reach the visit when the problem is already advanced.

The table is not for putting a label on your own animal but for understanding why the same word, cough, leads to different paths. Telling the causes apart is the vet's job, with the examination, chest auscultation and necessary tests. The owner's role is to describe well and not to minimise, especially in the cat.

Some combinations turn a cough into a reason to move at once. The most important criterion is breathing effort: if the animal shows signs of difficulty breathing, the cough stops being a detail and becomes an emergency. In these cases you do not wait for the next day and you do not try any home remedy.

• Laboured or rapid breathing, or belly pushing to breathe, especially at rest.
• Gums or tongue turning bluish or grey: this is an immediate emergency.
• Open mouth breathing in a cat, which is always abnormal and never to underestimate.
• Continuous coughing that prevents sleeping, eating or settling.
• Appearance of foam, heavy mucus or blood with the cough.
• Collapse in energy, food refusal, apparent fever or a swollen abdomen alongside the cough.
• Cough that appeared after a possible choking episode or a foreign body.

One simple parameter helps distinguish an evolving respiratory problem from an isolated episode: the resting respiratory rate, that is the number of breaths per minute while the animal sleeps or rests quietly. It is a value you learn to count at home and one the vet greatly appreciates, because a relaxed animal in its own environment gives a more reliable figure than one collected in the clinic, where everything is altered by tension.

1. 1

   Count the breathing at rest

   With the animal asleep or resting, count how many times the chest rises in a minute. Repeat on different days to get a usual reference value.

2. 2

   Log the coughing episodes

   Date, time, duration, sound and what preceded them. A diary shows a trend that memory alone tends to distort.

3. 3

   Film a typical bout

   A short video to show the vet captures sound and sequence better than any spoken description.

4. 4

   Observe the surroundings

   Appetite, energy, exercise tolerance and any shortness of breath: these elements give the cough its meaning.

5. 5

   Bring the data to the visit

   The usual respiratory rate, the diary and the video let the vet start from a concrete baseline rather than a memory.

A stable rise in the resting respiratory rate compared with the usual value is a signal not to ignore, even without an obvious cough, and should be reported to the vet. Conversely, an isolated cough in an animal that eats, plays and breathes quietly at rest is less concerning, but still something to mention at the check-up, especially if it recurs.

Some environmental factors irritate the airways and can trigger or worsen a cough in predisposed animals. Reducing them does not replace a diagnosis, but it removes avoidable triggers and helps understand how much the environment weighs compared with the underlying cause.

If the cough improves noticeably when you reduce one of these factors, that is useful information to bring to the vet, not proof that the problem is solved. The underlying cause still needs assessing, because an irritant environment often worsens an existing problem more than it creates one from nothing.