When faced with the problem of animals coughing in the autumn, lungworm (hoose) is often the prime suspect. Lungworms like and thrive in Irish weather and grazing systems. Outbreaks can be very unpredictable, but usually occur later in the summer and into the autumn, especially a few weeks after a prolonged period of rain.

Lungworm can also be a reason for a severe drop in milk yield. The parasites can cause extreme irritation and damage to the lungs, with some animals dying suddenly.