Received: 23 July 2020
Accepted: 5 March 2021
First Online: 12 March 2021
: Dog-owners gave consent for using samples for research in cancer diseases. These samples had been taken for clinical purposes, and samples were archived and used for this study. This study used archived samples and ethical approval was deemed unnecessary according to Norwegian Food Safety Authority and national regulations (LOV-2009-06-19-97/FOR-1996-01-15-23).
: Not applicable.
: The authors declare no conflict of interest.