MUST WATCH: Rescued lab dogs see the outdoors for the first time

LAS VEGAS, Nev. — They were used for testing in research labs, kept in cages their entire lives.

But last week, nine Beagles — called the “Lucky 9″ — were rescued from a lab in Nevada by the Beagle Freedom Project.

Their lab numbers were removed, and they were given real names.

Then, they were introduced to the sun, fresh air — even grass — for the very first time, according to the project’s website.

No one knew how the dogs would react after a lifetime indoors. But soon their instincts took over.