Received: 10 January 2017
Accepted: 20 February 2018
First Online: 5 March 2018
Ethics approval and consent to participate
: The study complies with the European Directive 2010/63/EU. The study design was reviewed and approved by the Ethics Committee of the University of Life Sciences in Lublin (Poland). The study encompassed dogs from a private kennel and informed consent was obtained from the owner. The consent was provided in written form. No additional permission was required.
: Not applicable.
: The authors declare that they have no competing interests.
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