One can be at a disadvantage when having rules to constructing a poem, but it can be another way of making poetry. Fixed form is basically like following instructions to making a poem. The outline is already done for you, all you need to do is fill it with words. An example of fixed form can be the Haiku. It can be a restricting process, but the end result is a glimpse of the poet's observation which leaves an imprint of that image in the reader.
I made an Iambic trimeter poem here, more of a parody of My Papa’s Waltz with an A,B,A
rhyme scheme. It is not fixed formed nor is it perfect iambic trimeter, but I tweaked the rules in order to make it more appropriate for my poem. First rule for fixed forms: don't let the rules bully you, but instead use and change them to your advantage until you get the desired message (if you wan't). The results:
My Doggy’s
Walk
He walks, head held proudly
Royalty in his blood
Flowing with dignity
Gallops,
avoiding sod
Putting paw down seriously
Making sure he is heard
Barks with great authority
Being the king of the herd
Made with the smallest paws
Eyes look ready to pop
Tail curls with grace, no flaws
Perfection does not stop
Hearing other dogs bark
He pulls and yanks angrily
Finding
nothing too dark
Finest of ingenuity
