Clark, Annie Rodgers; Brace, Andrew H. (1995). The International Encyclopedia of Dogs. New York: Howell Book House. pp. 8. ISBN0-87605-624-9. «In the strictest sense, dog breeds date back only to the last couple of decades of the nineteenth century, or to more recent decades in this (the twentieth) century but distinct types of dogs have existed centuries earlier.»
beautdogs.com
D. Phillip Sponenberg, DVM. «Livestock Guard Dogs: What is a Breed, and Why Does it Matter?»(essay). Kangal Dogs website. Archivado desde el original el 20 de octubre de 2004. Consultado el 4 de agosto de 2004. «The level of uniformity varies from breed to breed as the breeders' associations decide what to include and what to exclude.»
cdrcp.org
HistoryArchivado el 25 de febrero de 2013 en Wayback Machine.; The Carolina Dog Rascue and Conservation Project. Consultado el 31 de enero de 2013.
Carles Vilà (et al.) of the University of California, California, USA, has studied archaeological evidence (fossil bones) indicating that canids could have been living with humans 100,000 years ago.Carles Vilà; Peter Savolainen; Jesús E. Maldonado; Isabel R. Amorim; John E. Rice; Rodney L. Honeycutt; Keith A. Crandall; Joakim Lundeberg et al. (1997). «Multiple and Ancient Origins of the Domestic Dog». Science Vol. 276. no. 5319. pp. 1687-1689. doi:10.1126/science.276.5319.1687. Consultado el 04/20 2008. «The sequence divergence within this clade suggested that dogs originated more than 100,000 years before the present.»Se sugiere usar |número-autores= (ayuda)
1Catherine Marley. «What is a "Landrace"». The Lhasa Apso Information Source. Archivado desde el original el 12 de abril de 2008. Consultado el 04/08 2008. «These animals developed their "type" from adaptation to a mix of function and the demands of the particular physical environment.»
Johan Gallant; Joseph Sithole (1 de enero de 1999). «Description of the AFRICANIS landrace». Breeders in Africa website. Consultado el 04/08 2008. «The people to whom these dogs traditionally belong do not tend to make body contact with them. However their settlements are seldom deserted from humans, other dogs and livestock, ensuring adequate socialization and environmental adaptation.»
Carles Vilà (et al.) of the University of California, California, USA, has studied archaeological evidence (fossil bones) indicating that canids could have been living with humans 100,000 years ago.Carles Vilà; Peter Savolainen; Jesús E. Maldonado; Isabel R. Amorim; John E. Rice; Rodney L. Honeycutt; Keith A. Crandall; Joakim Lundeberg et al. (1997). «Multiple and Ancient Origins of the Domestic Dog». Science Vol. 276. no. 5319. pp. 1687-1689. doi:10.1126/science.276.5319.1687. Consultado el 04/20 2008. «The sequence divergence within this clade suggested that dogs originated more than 100,000 years before the present.»Se sugiere usar |número-autores= (ayuda)
sciencenews.org
Christine Mlot (28 de junio de 1997). «Stalking the Ancient Dog». Science News Online. Consultado el 04/20 2008. «When we became an agricultural society, what we needed dogs for changed enormously, and a further and irrevocable division [between dogs and wolves] occurred at that point.»
1Catherine Marley. «What is a "Landrace"». The Lhasa Apso Information Source. Archivado desde el original el 12 de abril de 2008. Consultado el 04/08 2008. «These animals developed their "type" from adaptation to a mix of function and the demands of the particular physical environment.»
D. Phillip Sponenberg, DVM. «Livestock Guard Dogs: What is a Breed, and Why Does it Matter?»(essay). Kangal Dogs website. Archivado desde el original el 20 de octubre de 2004. Consultado el 4 de agosto de 2004. «The level of uniformity varies from breed to breed as the breeders' associations decide what to include and what to exclude.»
HistoryArchivado el 25 de febrero de 2013 en Wayback Machine.; The Carolina Dog Rascue and Conservation Project. Consultado el 31 de enero de 2013.
