Its a great idea to wish your father on his birthday with the help of a poem dedicated to him. You can choose the wordings of the poem according to what your heart wants to express and let your dear dad know. A short and sweet birthday poem for your dad can be:

You always showed me how to be happy,

Even while you helped Mommy to change my nappy.

You mean the world to me my dear,

Without you my future looks unclear.

Happy Birthday to the best daddy in the world.

Another such poem can be:

My father is the best

From the Far East

To the Wild West.

You have shown me the way,

And made me able to stand,

There is nothing more to say:

Have a birthday happy and grand!