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in Health & Wellness // Conditions & Diseases

Aspiration (or Inhalation)
Pneumonia in Dogs

Pneumonia dog image 1

Dog owners need to be aware of the risk of aspiration (or inhalation) pneumonia.

WHAT IS ASPIRATION (OR INHALATION) PNEUMONIA?

Pneumonia dog image 2Aspiration pneumonia, also called inhalation pneumonia, occurs when a dog’s lungs become inflamed due to the aspiration or (inhalation) of a foreign substance, including vomit, food, foreign bodies, and regurgitated gastric acid. This leads to a bacterial infection in the respiratory tract. This usually occurs after a dog vomits and inhales a portion of the regurgitated material. 

The seriousness of the condition depends on the bacteria that are present in the inhaled material, and the distribution of the aspirated material into the lungs.

If the pneumonia is severe enough to restrict the flow of oxygen, aspiration pneumonia can be life-threatening.


CAUSES OF ASPIRATION PNEUMONIA

It's not the actual vomiting that causes aspiration pneumonia. It's the bringing up of contents from the stomach that are then inhaled. Inhalation of foreign matter, from vomiting or from the regurgitation of gastric acid contents can be problematic.

Inhalation of smoke, kerosene, mineral oil, gasoline, or other caustic chemicals can also cause problems.

Neuromuscular disorders, which would cause difficulty with swallowing, can also result in aspiration pneumonia.  A common cause of aspiration pneumonia is faulty administration of liquid medication. Any liquid that's given via syringe, whether medication or food, must not be given any faster than the animal can swallow, or there is a risk of aspiration pneumonia.

DOGS AT RISK OF ASPIRATION PNEUMONIAPneumonia dog image 3

Dogs that develop aspiration pneumonia typically have a history of:

• Vomiting
• Recent anaesthesia
• Neurologic problems
• An underlying medical condition that predisposes the dog toward aspiration


Medical conditions that make a dog more likely to inhale matter that
has been vomited into their lungs include:

• Laryngeal paralysis
• Megaesophagus
• Persistent right aortic arch (seen in puppies)
• Congenital oesophagus problems
• Gastrointestinal disease

Dogs that are force-fed have a higher risk. Puppies are also at risk of aspiration pneumonia, especially if they're bottle-fed.

Pneumonia dog image 4SYMPTOMS OF ASPIRATION PNEUMONIA

Aspiration pneumonia may include:

• Loss of appetite
• Regurgitation
• Vomiting
• Coughing
• Fever
• Lethargy
• An altered mood
• Breathing difficulties
• Swallowing difficulties
• Panting
• An increased heart rate
• Exercise intolerance due to weakness
• Open mouth breathing
• Noisy or wet breathing
• Discharge from nasal passages
• Blue-coloured gums
• A bluish tinge to the skin (cyanosis)
• Stretching of the neck out to breath
• Collapse

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