Is it normal for a dog to breathe heavily and pant loudly?

Firstly, if the dog has just finished exercising, this is normal and the dog can relieve itself. Secondly, it can also occur when the dog is scared, nervous or threatened and the owner should reassure him. In addition, some illnesses can cause shortness of breath and loud panting, such as airway obstruction, respiratory illness, heat stroke, hypoglycaemia and heart and lung problems. This condition is often accompanied by other unusual symptoms such as poor spirits and owners should monitor the dog closely and take him to the doctor if they see anything unusual.