Q:What are the main reasons that your sheep cough and have a runny nose? A: Infectious diseases: 1. Actinomycete infection: Actinobacillosis can cause nasal lesions and sometimes runny nose. 2. Melioidosis: ulceration of nasal mucosa, pneumonia and abscess in different organs. Parasitic disease: 1. Pulmonary parasites: lungworms can be found in postmortem autopsy. 2. Nasal myiasis: there are nasal bots larvae in the nasal cavity and ever have a regional disease history. Common Diseases: 1. Pneumonia: There are 14 types of pneumonia, which are all characterized by cough, high body temperature, depression, loss of appetite,etc. 2. Wrong drug drench: poor drug drench technology can cause suppurative pneumonia and damage to pharynx, throat and head. 3. Plant Damages:Verbescina encelioides and other plants can cause pneumonia and runny nose 4. Too much dust in pens or surroundings: it can cause nasal congestion. 5. Malnutrition: runny nose of lamb or young sheep is one of the symptoms of malnutrition. 6. Nasal congestion: it is common and often occurs in groups. Mainly runny nose only, without systemic symptoms.