By Sarah Bennett
Understanding Feline Asthma
Feline asthma is one of the most common chronic respiratory conditions in cats, affecting an estimated one to five per cent of the domestic cat population across Europe. It is caused by hypersensitivity of the lower airways — the bronchi and bronchioles — which leads to inflammation, bronchoconstriction, and excess mucus production. When a susceptible cat encounters a trigger, the airways narrow rapidly, making it difficult to breathe. The result can range from a mild, recurring cough to a life-threatening respiratory crisis.
Feline asthma is often discussed alongside chronic bronchitis, and distinguishing between the two matters clinically. In asthma, airway narrowing is largely reversible and driven by an allergic or hypersensitivity response. Chronic bronchitis involves persistent, irreversible airway inflammation without the same degree of bronchoconstriction. In practice, many cats have features of both conditions simultaneously, which is why veterinary internists sometimes refer to feline inflammatory airway disease as an umbrella term. For owners, however, the practical management of both conditions overlaps considerably.
Common Triggers
Environmental irritants play a central role in triggering asthma episodes. The most frequently identified triggers include:
- Dusty cat litter — fine silica or clay particles are a major source of airborne irritants in the home
- Cigarette and wood smoke
- Aerosol sprays including air fresheners, cleaning products, and perfumes
- Mould spores and damp indoor environments
- Seasonal pollen, particularly grass and tree pollen
- Scented candles and incense
- Dusty or mouldy hay and bedding in multi-pet households
Identifying and removing triggers is one of the most effective steps an owner can take. Switching to a low-dust or dust-free litter — options are widely available through pet retailers such as Zooplus, which stocks a broad range of dust-free and natural litters specifically suited to cats with respiratory sensitivities — can make a meaningful difference to how frequently an asthmatic cat experiences episodes.
Clinical Signs: What to Look For
Recognising asthma early gives owners the best chance of seeking veterinary care before a cat deteriorates. Clinical signs vary in severity and may be intermittent, which can make them easy to dismiss in the early stages.
The most characteristic signs of feline asthma include:
- A dry, hacking cough — often mistaken by owners for hairball attempts
- Audible wheezing, particularly on exhalation
- Laboured or rapid breathing at rest
- Open-mouth breathing, which is always abnormal in cats outside of extreme heat or stress
- A distinctive crouching posture with the neck extended and elbows held away from the body — the cat's attempt to maximise airway diameter
- Exercise intolerance or reluctance to move
- Increased respiratory rate during sleep (owners can count chest movements per minute; more than 30 per minute at rest warrants veterinary attention)
Episodes may be mild and self-limiting or may escalate quickly. Some cats cough daily for weeks before an acute crisis; others have their first observable episode as a severe attack requiring emergency care.
Diagnosis: How Vets Confirm Asthma
There is no single definitive test for feline asthma. Diagnosis is based on a combination of clinical history, physical examination, imaging, and in some cases airway sampling. European veterinary guidelines, including those from the European College of Veterinary Internal Medicine — Companion Animals (ECVIM-CA), recommend a structured diagnostic pathway to rule out other causes of coughing and dyspnoea such as cardiac disease, pleural effusion, lungworm, and neoplasia.
Thoracic Radiographs
Chest X-rays are typically the first diagnostic step. In asthmatic cats, radiographs may reveal a classic bronchial pattern — thickened airway walls visible as parallel lines or rings — as well as hyperinflation of the lungs caused by air trapping. However, radiograph findings can appear normal in up to 25 per cent of asthmatic cats, so a normal X-ray does not rule out the condition.
Bronchoscopy and Bronchoalveolar Lavage
When the diagnosis remains uncertain or the cat fails to respond to initial treatment, bronchoscopy and bronchoalveolar lavage (BAL) provide more specific information. BAL involves flushing a small volume of sterile saline into the airways and recovering it for cytological analysis. A predominance of eosinophils in the recovered fluid strongly supports a diagnosis of asthma, whereas neutrophilic inflammation is more typical of chronic bronchitis or infection. These procedures require general anaesthesia and are usually performed at specialist referral centres across Europe.
Treatment and Management
Corticosteroids
Anti-inflammatory treatment with corticosteroids is the cornerstone of feline asthma management. Steroids reduce airway inflammation and, over time, help prevent airway remodelling — the irreversible structural changes that occur in chronically inflamed airways. Treatment can be delivered systemically (oral prednisolone or injectable methylprednisolone) or via inhalation.
Inhaled corticosteroids are increasingly favoured by European veterinary specialists because they deliver medication directly to the airways at low doses, minimising systemic side effects such as diabetes mellitus and immunosuppression. Fluticasone propionate is the most commonly used inhaled corticosteroid in cats across the EU.
The AeroKat Inhaler System
Administering an inhaler to a cat requires a specially designed spacer device. The AeroKat chamber, manufactured by Trudell Medical International, is widely used across Europe and is available through many veterinary practices and online suppliers. It consists of a small-volume spacer with a flow indicator and a soft feline face mask. Owners hold the mask gently over the cat's nose and mouth, actuate the inhaler into the chamber, and allow the cat to take seven to ten breaths. Most cats tolerate the system well after a brief period of acclimatisation.
Bronchodilators
Bronchodilators such as salbutamol (albuterol) are used as rescue medications during acute episodes. They relax the smooth muscle of the bronchi rapidly, relieving bronchoconstriction within minutes. Salbutamol can also be administered via the AeroKat system. It is important that bronchodilators are used as rescue treatment rather than as a substitute for anti-inflammatory therapy-dog-breeds-guide" title="Therapy Dog Breeds Guide">therapy — overreliance on bronchodilators without addressing underlying inflammation is associated with poorer long-term outcomes.
When to Seek Urgent Veterinary Attention
Certain signs indicate that a cat is in respiratory distress and requires emergency care without delay. Do not wait for a routine appointment if your cat shows any of the following:
- Cyanosis — a blue or grey tinge to the gums or tongue, indicating critically low oxygen levels
- Open-mouth breathing that does not resolve within a few minutes
- Extreme distress, panic, or inability to settle
- Collapse or loss of consciousness
- Breathing rate that appears very rapid or very shallow despite minimal exertion
A cat in acute respiratory distress is a veterinary emergency. Keep the cat as calm and still as possible, minimise handling, and transport immediately to the nearest open veterinary clinic. Phone ahead if possible so the team can prepare oxygen support on arrival.
Living Well with an Asthmatic Cat
With appropriate treatment and environmental management, the majority of asthmatic cats maintain a good quality of life. Regular veterinary monitoring — including periodic reassessment of resting respiratory rate at home and scheduled check-ups — helps ensure that treatment remains effective as the condition evolves. Working closely with a vet who is familiar with ECVIM-CA and ABVP respiratory guidelines gives owners the confidence that their cat's care reflects current best practice across Europe.