Anacoluthon

The name of his dog is — I don't really remember right now.

Another species of anacoluthon is when, after the sentence is begun with a participle, the construction passes over into a finite verb, where we should naturally expect the participial construction to be continued.

Anacoluthon, though a grammatical defect, is a rhetorical beauty, if naturally produced or imitated; as, "If thou art he—but oh! how fallen!"