1. Asher, L., Diesel, G., Summers, J. F., McGreevy, P. D., & Collins, L. M. (2009). Inherited defects in pedigree dogs. Part 1: disorders related to breed standards. The Veterinary Journal, 182(3), 402–411.
2. BBC Scotland (2015). Sellers using fake identities online to conceal illegal trade of puppies.
http://www.bbc.co.uk/news/uk-scotland-32305787
. Accessed 14 June 2016.
3. Bradshaw, J. (2012). In defence of dogs. London, UK: Penguin.
4. British Veterinary Association [BVA]. (2015). Still fishing for chips—a quarter of dogs not microchipped with less than a year to go.
http://www.bva.co.uk/News-campaigns-and-policy/Newsroom/News-releases/Quarter-dogs-not-microchipped-less-than-a-year-to-go/
. Accessed 1 July 2015.
5. Cusdin, P. A., & Greenwood, A. G. (2000). The keeping of wolf-hybrids in great Britain. Keighley: International Zoo Veterinary Group