L Toresson1,2, J M Steiner3, J S Suchodolski3. 1. Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, Helsinki University, Agnes Sjobergin katu 2, 00014, Helsinki, Finland. linda.toresson@evidensia.se. 2. Evidensia Specialist Animal Hospital, Bergavagen 3, 25466, Helsingborg, Sweden. linda.toresson@evidensia.se. 3. Gastrointestinal Laboratory, Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, 4474 TAMU, College Station, TX, 77843-4474, USA.