The dog (scientific classification fica "Canis familiaris") has been always recognized as
"Man's Best Friend. This relationship, established from the beginning of everything, has evolved until becoming new forms of interaction man-dog, which are origin of great benefits for the
society.
 Traditionally, the dog has helped the man in tasks such as hunting, surveillance and as invaluable help in the cattle grazing. Nevertheless, insofar as the
society has evolved since small farming communities, to growing areas metropolitan, the role of the dog has changed. Over the years the dog has helped locate people disappeared and it has been help in rescue operations
that follow the tragic events like earthquakes and explosions. In addition, the dog served together to soldiers in the patrol area In the Second World War and in the Vietnam War. However, the dog ha been particularly successful in the area of narcotics detection. Today, the companionship of
dog has added a meaning additional, to the extent that the American every time in greater number, consider the dog as another member of the family instead of a mere property. More than 30 million Americans they coexist with one or more dogs (Marks, 1999). From
according to a national survey,
Most owners of dogs selected as
 the main reason to have a dog the relationship of companionship achieved with the animal (American Animal Hospital Association, 1995). After everything, the

dog does not judge, gives love unconditional, and we can do of them the biggest confidant
of our most intimate feelings. In addition, the dog  s extremely intelligent, for so you can be trained to do many things. These Dog characteristics can
serve to raise the quality of life for thousands of young people and adults, especially those
incapacitated and / or those who reside in institutions of I take care
In the state of Alabama there are approximately 320,625 people between the ages of 16 to 64 years with some type of disability (U.S. Census, 1990).
Of this total, 156,271 people, of which 53 percent are women, have
limitación de movimiento o limitaciones para su auto-cuidado. Más aún, 10.8 por ciento de las personas con las limitaciones arriba indicadas viven solas y el 0.6 por ciento vive en instituciones de grupo tales como centros de rehabilitación, refugios u hogares de cuido. El meramente abrazar un perro hace que residentes en centros de rehabilitación y hogares de cuido, pacientes en hospitales y familias en general sientan un consuelo, un gozo y un respeto por todos los seres vivientes. En adición, la compañía del perro ha demostrado proveer otros beneficios que pueden mejorar la calidad de vida de muchos miles más de ciudadanos de Alabama. Esta publicación pretende discutir y examinar los beneficios físicos, fisiológicos y sicológicos que brinda la compañía de un perro.