Have You Seen Bull, The Missing Fire Department Mascot?

(CBS) -- A beloved dog that's become part of the family at one Chicago firehouse is missing.

Now, the Chicago Fire Department needs your help to find him.

Bull is a rescue dog and is just shy of his second birthday. Last Sunday, during shift change , he broke free and hasn't been back since.

Mike Sullivan, a firefighter at the West Englewood firehouse, says it's been a rough week without him.

"It's affected not just the firehouse and my family but the neighborhood also," he says.

Sullivan says don't let his appearance intimidate you. He's lovable and sweet as pie.

If you see Bull, you're asked to call 3-1-1.