Funding for this research was provided by:
Morris Animal Foundation (D15CA-907)
School of Veterinary Medicine, University of California, Davis (2016-24-F)
Received: 20 November 2017
Accepted: 12 June 2018
First Online: 27 June 2018
: The study protocol was approved by the Institutional Animal Care and Use Committee at the University of California, Davis. All samples were collected after informed written consent was obtained from the owners.
: Not applicable.
: The authors declare that they have no competing interests.