Pete Wentz 's Childhood Pet Dies

Rocker Pete Wentz is mourning the loss of his childhood dog after the pet pooch died on Saturday.

The Fall Out Boy bassist broke the tragic news on his Twitter.com blog, in which he expressed his regret at not flying home to Illinois sooner to spend some time with beloved mutt Chi.

Wentz wrote, "Sorry I didn't say bye Chi. The dog I just grew up with passed away today..."