Bolt's Mark of Power

Bolt's Mark of Power is the emblem associated with Bolt and is often seen as his personal mark, when he and Penny were in the Bolt TV show.

Lore
When Bolt became a "superdog" for a TV show that was named after him, a black lighting bolt was place on the right side of his body and printed into his white fur. To Bolt it was the sores of his superpowers that allows him to protect Penny from Dr. Calico and his men. When really it was just black makeup that was placed onto his fur and to give the show a logo and personal mark that has something to do with it's star. When Bolt went missing Penny mentioned the mark in her Lost Dog flyers, while the mark itself was replaced on the dog that the studio had got to place him.

On Bolt's journey home and when he realized that Mittens was right about him not being a "superdog", he touched the wet and started to fade lighting bolt and looked at the dark, wet makeup on his paw. As Bolt, Mittens and Rhino continued their journey the mark was washed away from the rain, as Bolt began to stick his nose into the cold, damp weather like a real dog. By the time they got to Hollywood it was completely faded away on his white fur, while Bolt's replacement kept it.