Affiliation: | 1. Boehringer Ingelheim Vetmedica, Ellesfielfd Avenue, Bracknell, Berkshire RG12 8YS;2. Veterinary Cardiorespiratory Centre, Thera House, Waverley Road, Kenilworth, Warks CV8 1JL;3. Royal (Dick) School of Veterinary Studies, The Roslin Institute, Division of Clinical Veterinary Studies, The University of Edinburgh,Hospital for Small Animals, Easter Bush Veterinary Centre, Roslin, Midlothian EH25 9RG |