This video shows the typical stance of an irish wolfhound with pneumonia. If you see this in your Irish wolfhound, go straight to the vet and demand immediate treatment with antibiotics. The dog may or may not have fever, the blood samples may well be normal, and the lungs may or may not be congested on x-rays.
If not taken seriously, this condition will almost certainly be fatal for your dog. Please read the leaflet from the Irish Wolfhound Health Group for further info: iwhealthgroup.co.uk/files/GUIDE-pneumonia.pdf