A dog walks into a butcher shop, spends a number of minutes looking at the meat on display and eventually indicates with a nod of his head and a bark that he'd like some lamb chops. The butcher, thinking the dog wouldn't know better, picks up the lowest quality chops in the shop. The dog barks furiously and continues to bark until the butcher selects the finest chops from the display counter. The butcher weighs the meat and asks the dog for $5. Again, the dog barks furiously until the butcher reduces the bill to the correct price of $3. The dog hands over a five-dollar note and the butcher gives him 50 cents in change. Once again, the dog barks continuously until the butcher tenders the correct change. The dog then picks up his package and leaves the shop.
Now, the butcher is extremely impressed and decides that he'd like to own a dog so clever. He closes the shop and follows the dog to see where it goes. After ten minutes or so, the dog climbs the steps to a house. When it gets to the top, it shakes its head as though in frustration, gently places the package of meat on the floor and standing on its hind legs, rings the doorbell. A man opens the door and starts to yell obscenities at the dog.
As he does so, the horrified butcher leaps up the steps and begs the man to stop. "It's such an intelligent dog," he says, "surely it doesn't deserve this kind of treatment." He then went on to explain how the dog had procured the best lamb chops in the shop, insisted on paying the advertised price and quibbled over incorrect change!
The man looked at the butcher and said, "Intelligent he may be, but this is the third time this week he has forgotten his keys."