Ventilatory Functions and Physical Intolerance in ESRD Adolescents: Response to Program of Walking With Dogs

End stage renal diseased adolescents (numbering forty) will be grouped randomly to two random groups, twenty adolescents in group I or group II. Both groups will trained by incentive spirometer 30 min during the sessions of dialysis three applications weekly for 12 weeks. Group I will additionally walked freely with a dog 30 min three times weekly (in opposite days of hemodialysis). The duration of this trial will be 12 weeks.