Giving the pipe to fluffy

i am trying to start the mini game by giving the pipe to fluffy but all i get is "i don't know how to fill". Can anyone help me pppppppleaaase?

Welcome to the pond traceyella!

Have you gone to the pharmacist about Fluffy? You may need to talk to him first to trigger the chess mini game.

Here is a link to the walkthrough in case you would like to see the screen shots.

Hope this helps!
bfgTigris