Mac Guy Trades Mouse for Dog

2/28/2007 3:25 PM PST BY TMZ STAFF
Friendly dude Justin Long is taking steps to make sure his new co-star is in shape for their upcoming film.

Cameras caught everyone's favorite Mac guy taking a break from doggin' PC's and took his four-legged friend Moose for a walk on Robertson Blvd. yesterday. During the stroll, the "Die Hard 4" actor revealed that he and his pooch are working on an "upcoming project" together. Yippee-ki-yay, motherf***er!

Justin was wearing his Three Brothers Bus Tour jacket from his role in "The Break-Up."