Mamamu Yan

Mamamu Yan is a woman in The Legend of Zelda: Majora's Mask. She owns many dogs and is found standing at Mamamu Yan's dog racing course. If you pay her 10 rupees, she lets you pick a dog that you think is going to win the next race. If that dog wins, you get three times the amount of rupees that you bet. If you pick up a dog when wearing the Mask of Truth you can see if the dog thinks he's able to win. This is very helpful.

She also plays a part in the Oracle of Ages trading sequence, giving link the Dumbbell in return for the Doggie Mask.