I trained my puppy to speak very similar to what Dixieland Dancer described. She picked it up very quickly. Her mother however, refuses to speak. If I get her excited, and she sees her puppy get treats for speaking, she does her version of speak, but she gets frustrated easily.

When training a dog, do the trick at least 5 times but less that 10. Your dog needs repetition to learn but too may times may frustrate her. Don't tell anyone, but it may help your dog if you bark as well when you say speak.) Just make sure no ones around, or they may think you're a little weird.