In this Thursday, April 10, 2014 photo, French bulldog Dago, gets a workout on a treadmill with trainer Israel Martinez, at the Pet Central spa in Mexico City. 'Today people invest in their dog,' said animal behaviorist Renan Medina, one of the founders of MEDICAN, Mexico's first animal hospital with a hyperbaric chamber, used to accelerate the healing of wounds and infections. (AP Photo/Rebecca Blackwell)