Pneumonia is the inflammation of the lung parenchyma. It is usually accompanied by inflammation of the bronchioles and may get complicated with the extension of infection to the pleura, leading to pleurisy.

Pulmonary emphysema is a distention of the lung caused by one distention of the alveoli with rupture of the alveolar wall, with or without the escape of air into the interstitial space.

Engorgement of the pulmonary vascular bed and subsequent increase in the amount of blood in the lung parenchyma is called pulmonary congestion, which later on leads to the escape of fluid into the interstitial space and alveoli, referred as pulmonary edema in animals.

Diseases of the respiratory tract in animals are commonly encountered in routine clinical practice and therefore form an important clinical entity for clinicians.

Inflammation of the intestinal mucosa results in diarrhoea, dysentery (faeces mixed with mucus and blood), and accompanying signs of dehydration and acid-base imbalance in animals, which is called enteritis.

Edema or oedema refers to the excessive accumulation of fluid in tissue spaces and body cavities, involving a disturbance in the mechanism of fluid exchange between capillaries, tissue spaces, and lymphatic vessels.

Diseases of the alimentary tract of horses that are characterised by abdominal pain are generally referred to as equine colic.

In Exocrine Pancreatic Insufficiency (EPI) in Small Animals (dog, cats etc.), the exocrine functioning of the pancreas is affected, which is clinically manifested by passing voluminous, glistening faeces, persistent weight loss in spite of good appetite, PICA, coprophagia (eating own faeces), etc.

Pancreatitis is the inflammation of the pancreas. pancreas, which is the chief exocrine gland responsible for the secretion of pancreatic juice that helps in the digestion of food.