Dave Morice's sonnetized Mary in the May 2000 Kickshaws inspired me to transpose the letters of Shakespearean Sonnet 143 into an approximation to "Mary Had a Little Lamb". As can be seen, the subject of Sonnet 143 also involves domestic animals!
"Another Mary Sonnet,"
Word Ways: Vol. 33
, Article 18.
Available at: http://digitalcommons.butler.edu/wordways/vol33/iss3/18