Pneumonia in dogs is an inflammatory process that affects the lung tissue and can impair the flow of oxygen into the blood. It can be caused by bacteria, viruses, fungi, parasites, or by aspiration of vomit, food, fluids, or other substances.
Severity ranges from localized symptoms, accompanied by coughing and reduced exercise capacity, to life-threatening respiratory emergencies. Labored breathing, bluish mucous membranes, severe weakness, or an inability to rest require immediate veterinary intervention.
What is pneumonia?
The lungs are made up of bronchi, bronchioles, and alveoli, small structures where oxygen and carbon dioxide are exchanged. When lung tissue becomes inflamed, the alveoli can fill with fluid, inflammatory cells, and secretions.
This condition reduces breathing capacity and can lead to a decrease in oxygenation of the body. Pneumonia should not be confused with a simple throat irritation or an occasional cough.
Main forms of pneumonia in dogs
The classification depends on the cause and the way in which the inflammation reaches the lung.
Bacterial pneumonia
Bacterial pneumonia can develop when microorganisms reach the deep respiratory tract. It may be promoted by previous respiratory infections, a weakened immune system, swallowing problems, or airway diseases.
It can also appear as a complication of infectious tracheobronchitis, especially in puppies, older dogs and debilitated subjects.
Aspiration pneumonia
Aspiration pneumonia occurs when vomit, food, water, saliva, liquid medications, or other substances enter the windpipe and reach the lungs.
The aspirated material initially causes chemical and inflammatory damage, which can lead to a bacterial infection. This can be particularly serious.
Conditions that increase the risk include:
- frequent vomiting or regurgitation;
- megaesophagus;
- laryngeal paralysis;
- neurological or neuromuscular disorders;
- difficulty swallowing;
- changes in the esophagus;
- loss of consciousness or convulsions;
- anesthesia and recovery phase;
- forced administration of food or liquids;
- feeding puppies with incorrect technique.
Viral pneumonia
Some respiratory viruses can damage the airway defenses and promote subsequent bacterial infection. Viral viruses can spread more easily in environments where many dogs live together, such as kennels, boarding kennels, breeding facilities, and dog shows.
Fungal pneumonia
Some environmental fungi can reach the lungs through inhalation of spores. These forms also depend on the geographic distribution of the microorganisms and can present as systemic diseases, not limited to the respiratory tract.
Parasitic pneumonia
Various parasites can affect the bronchi, trachea, and lung tissue. Lungworm infestations can cause coughing, difficulty breathing, fatigue, and decreased performance.
Young dogs, outdoor dogs, and dogs that ingest snails, slugs, or other intermediate hosts may be at increased risk for certain parasitic diseases.
Foreign body pneumonia
Foxtails, plant debris, and other inhaled material can enter the airways and cause inflammation, localized infections, abscesses, and lung damage.
In dogs that frequent fields with dry vegetation, a sudden cough that appears during or after activity should be evaluated with particular care.
Symptoms of pneumonia
Symptoms vary depending on the cause, the extent of the inflammation, and the dog's general condition. The most common signs include:
- persistent cough, dry or productive;
- breathing faster than normal;
- increased respiratory effort;
- exercise intolerance;
- easy fatigue;
- fever;
- reduction in mood and reactivity;
- loss of appetite;
- nasal secretions;
- noisy breathing;
- dehydration;
- weight loss in chronic forms.
Coughing may not be present in all cases. A dog with pneumonia may primarily exhibit rapid breathing, weakness, and poor appetite.
Respiratory emergency signs
The dog must be taken immediately to a veterinary facility when it presents:
- open-mouth breathing not due to heat or exertion;
- strong movement of the abdomen during each breath;
- neck elongated and elbows kept away from the chest;
- inability to lie down or rest;
- bluish, greyish or very pale mucous membranes;
- collapse or loss of consciousness;
- extreme weakness;
- increasingly rapid and shallow breathing;
- foam or profuse discharge from the mouth or nose.
During a respiratory crisis, the dog should not be forced to walk, eat, or drink. It should be kept calm and transported with minimal stress.
How to check your breathing rate
Respiratory rate can be checked while the dog is sleeping or resting calmly by counting chest movements. One rise and fall corresponds to one breath.
The value should be measured for a full minute or 30 seconds and multiplied by two. In healthy dogs, the frequency is generally low during sleep; a persistent increase above normal values, especially if accompanied by exertion, coughing, or restlessness, should be reported to your veterinarian.
The number of breaths should not be assessed immediately after a run, during agitation or when the dog is hot, because in these conditions it can physiologically increase.
Aspiration pneumonia: when to suspect it
Aspiration pneumonia should be suspected when respiratory problems appear after:
- an episode of vomiting or regurgitation;
- the forced administration of fluids or drugs;
- a seizure;
- an operation under anesthesia;
- a near-drowning episode;
- the presence of difficulty swallowing;
- artificial feeding of a puppy.
Symptoms may appear immediately or develop over the next few hours. Cough, fever, weakness, or rapid breathing after any of these events require prompt medical attention.
What to do while waiting for the vet
If pneumonia is suspected, it is advisable to:
- stop any physical activity;
- keep the dog calm and in a well-ventilated environment;
- avoid smoke, dust, perfumes and other irritants;
- use a harness instead of putting pressure on the neck;
- contact the veterinarian describing the rhythm and pattern of breathing;
- carry the dog in the position that allows him to breathe better.
If possible, it's helpful to record a short video of your breathing and coughing. This footage can provide important information, especially if your symptoms change during the journey.
What not to do
In the presence of cough and breathing difficulties you should not:
- administer antibiotics left over from previous therapies;
- use cough syrups intended for people;
- administer cortisone or anti-inflammatories without a prescription;
- forcing water, food, or medications into your mouth;
- perform aerosols with substances not indicated by the veterinarian;
- expose the dog to very hot vapors;
- continue hunting or training;
- wait for a worsening when breathing is already labored.
Cough suppressants can be counterproductive when a dog needs to clear secretions from its airways. They should only be used in selected cases and under veterinary supervision.
Diagnosis
Diagnosis begins with a thorough medical history. It's important to report recent episodes of vomiting, regurgitation, anesthesia, fluid administration, difficulty swallowing, exposure to other dogs, or access to dry vegetation.
The veterinarian evaluates respiratory rate and effort, temperature, color of the mucous membranes, oxygenation level and lung sounds.
Investigations may include:
- chest x-rays;
- complete blood count and biochemical profile;
- measurement of blood oxygenation;
- stool test for lung parasites;
- tests for infectious agents;
- chest ultrasound;
- tracheal or bronchoalveolar lavage;
- cytological examination of secretions;
- bacterial culture and antibiogram;
- bronchoscopy in selected cases.
When a dog presents with severe respiratory distress, the priority is to stabilize it with oxygen and reduce stress. More complex tests can be postponed until the condition is safer.
Treatment of pneumonia
Treatment depends on the cause and severity. Dogs with respiratory distress, dehydration, or marked weakness may require hospitalization.
Treatment may include:
- oxygen therapy;
- carefully controlled fluid therapy;
- antibiotics when a bacterial infection is present or suspected;
- specific antiparasitic or antifungal drugs;
- nebulization prescribed by the veterinarian;
- techniques to promote the mobilization of secretions;
- nutritional support;
- treatment of the pathology that favored the aspiration;
- removal of any foreign bodies.
Antibiotic choice may be modified based on the culture and susceptibility test results. Treatment should be administered for the indicated duration and should not be discontinued as soon as the dog stops coughing.
Nebulization and respiratory physiotherapy
Nebulization with saline solution can help moisten the airways and thin secretions. In some cases, the veterinarian may combine it with gentle chest percussion, called coupage , to help loosen the mucus.
These techniques should be demonstrated by veterinary staff. They are not suitable for all patients and should not be improvised during a respiratory crisis.
House assistance
After discharge, the dog should rest in a quiet, clean, and smoke-free environment. Physical activity should be limited until the veterinarian authorizes a gradual return.
It's important:
- administer medications respecting doses and times;
- control appetite and water intake;
- measure breathing rate during sleep;
- observe any changes in cough;
- avoid contact with other dogs if a contagious cause is suspected;
- attend scheduled clinical and x-ray checks.
An improvement in mood doesn't necessarily mean the lungs are completely healed. Radiographic changes may take longer to resolve than symptoms.
Pneumonia and hunting dogs
Hunting dogs may be exposed to dust, mud, water, dry vegetation, and rapid breathing. These factors do not automatically cause pneumonia, but they can facilitate the inhalation of foreign material or expose existing respiratory problems.
Specific risks include:
- inhalation of grass awns and plant fragments;
- aspiration of water when crossing ditches and watercourses;
- contact with other dogs during trips and gatherings;
- lungworm infestations;
- inhalation of dust while working on dry land;
- delay in recognizing symptoms during strenuous activity.
A dog that suddenly slows down, coughs, breathes more heavily, or fails to recover normally after exertion should be stopped. A decrease in performance shouldn't be automatically attributed to fatigue or age.
Do cold and damp conditions cause pneumonia?
Cold, rain, and wet fur are not infectious in themselves and do not directly cause pneumonia. However, they can increase physical stress, promote hypothermia, and reduce the recovery ability of a dog already debilitated or suffering from a respiratory infection.
After an outing in difficult conditions, the dog must be dried, protected from drafts and monitored for the next few hours.
Prevention
To reduce the risk of pneumonia it is advisable to:
- keep the vaccination schedule up to date;
- avoid contact with dogs that have coughs or nasal discharge;
- ensure proper pest prevention;
- do not forcefully administer fluids or medications;
- do not use oil or liquid substances as home remedies;
- properly manage megaesophagus and swallowing disorders;
- follow the instructions before and after anesthesia;
- protect your dog from smoke and respiratory irritants;
- Have a persistent cough evaluated before resuming strenuous activity.
Is pneumonia contagious?
Pneumonia itself is not always contagious. Aspiration, foreign body, or parasitic forms are not normally transmitted through simple contact.
Some respiratory viruses and bacteria can spread between dogs. Until the cause is determined, it's prudent to avoid sharing food bowls, close contact, and staying in kennels, boarding kennels, or dog clubs.
Prognosis
The prognosis depends on the cause, the amount of lung involvement, the level of oxygenation, and how quickly treatment is started. Many dogs with bacterial pneumonia diagnosed early make a full recovery.
The prognosis becomes more cautious in the presence of severe respiratory failure, extensive aspiration, sepsis, neurological diseases, megaesophagus or repeated episodes of regurgitation.
In short (Italian only)
Pneumonia in dogs is a potentially serious respiratory disease that can result from infection, aspiration, parasites, or foreign bodies. Persistent coughing, fever, exhaustion, and rapid breathing require a visit to the veterinarian.
If your dog is breathing through his mouth, using his abdomen vigorously, has bluish mucous membranes, or is unable to rest, the situation should be considered an emergency. Prompt intervention increases the chances of recovery and reduces the risk of permanent lung damage.
