Back of the Line

Tom was walking down the street when he sees a funeral procession. At the head was the casket, behind was a man walking a very large dog and behind him were 300 people. Tom walks over to the guy with the dog and asks, "Who’s funeral is this?"
The man answers, “My mother-in-law’s.”
Tom wishes his condolences and asks, “She must of been a very important person, but what’s with the dog?”
"This is the dog that killed her.”
So Tom asks, “Can I borrow the dog for an hour?”
He responds, “Get in line!”