What part of speech his pig?

This phrase doesn't make sense grammatically. It's missing a verb to connect the subject ("his") and the object ("pig").

To figure out the part of speech, we need a complete sentence. For example:

* "His pig is muddy." In this sentence, "his" is a possessive pronoun, and "pig" is a noun.

* "He fed his pig." Here, "his" is a possessive pronoun, and "pig" is a noun.

Please provide more context so I can help you understand the parts of speech!