How does the title of the poem relate to its content?

The "collar" refers to a sense of confinement and constraint, similar to the collars worn by chained prisoners or dogs. However, Dale B. J. Randall suggests that the “collar” has multifaceted meanings, relating to homonyms include “caller” and “choler” (one who calls, and the humor that causes anger). Therefore, the symbol might be read to demonstrate both the constraint and the possibility present in religious submission.