The department of internal medicine has become especially important for the Pferdeklinik Leichlingen. As such, since 2014 it has been housed in a separate complex that recognises the specific requirements of this specialist field. The range of medical treatment offered embraces all common investigative steps, whether invasive (biopsies, punctures) or non-invasive (among them endoscopies incl. gastroscopy or sinus endoscopy, also heart, lung and abdominal cavity ultrasounds, etc.).