In a small bowl, combine the milk, peanut butter, and flour. Mix until completely combined.
Knead to complete the process.
Form the dough into little balls, depending on the size of the pills and how many.
Poke holes in the ball using the end of a meat thermometer or the end of a chopstick.
Store them in an airtight container, in the refrigerator.
They will keep until the expiration date of your milk.