Opportunity Should Knock First 300

Al and Joe break into an empty house to rob it. But is it? 300-word flash

Opportunity Should Knock First
“Nobody is home,” whispered Al to his partner Joe who was preparing to knock on the door.
Taking his word for it, Joe got out his lock picks and went to work on the lock. In no time at all, the door was opened and they were inside.
“No time to case the place for the most expensive stuff, just snatch and grab,” Al said.
Again, because he was the least experienced of the two, Joe listened. He had just emptied a jewelry box into his sack, when he saw something out of the corner of his eye.

A huge black dog was silently studying him while it did a low growl. He slowly backed up, never taking his eyes of the dog, that looked like a cross between a Doberman and a Great Dane.
He backed into the next room, which was the kitchen. He flattened himself against the wall, and silently closed the door. He could hear the dog sniffing around the bottom of it.
He, as quietly as possible, checked the usual places in the room for cash. An ice cream carton yielded some frozen assets and there was a change catch-all by the back door. There was a loud crash from the door Joe had closed and galloping sounds as the dog entered the room and raced around.

“That’s it, I’m outta here,” Joe said as he took to his heels. He went to the agreed-on meeting place. The bartender turned up the TV news.
“A would-be burglar was stopped by a case of heart failure. The guard dog of the house found him and let out a single bark he was clearly unprepared for. He died at the scene.”
“Opportunity should knock first and be sure of his facts,” Joe realized sadly.