I was working on some grammar schoolwork, some pronoun revisions and it states that the pronoun 'it' has no possessive, it has an adjective possessive, but not as a possessive pronoun. I'm confused. Isn't 'it's' the possessive pronoun? I've seen and heard it used in sentences like, 'The dog has it's ball' so wouldn't that mean the pronoun 'it' has a normal possessive like 'I' or 'her' or 'you'? The list is laid out like this in a table,
Subject Pronoun: I, you, it, he, etc.
Object Pronoun: me, you, it, him, etc.
Possessive Pronoun: mine, your,(none), his, etc.
Possessive Adjective: my, your, its, his, etc.
Am I correct in my thinking? That the 'it' pronoun does have a possessive like 'mine'?