Dogberry is the constable of the Watch, whose job is to patrol the streets of Messina at night and keep order. Dogberry has very few doubts about himself.
Some of these are not entirely warranted: he is a determined word-mangler, whose attempts to use learned words go continually awry, a fact of which he is blissfully unaware. Since none of his underlings understand either the words he is using or those he is attempting to, this goes unremarked upon by the lesser sort. He is also very conscious of his place, and continually interrupts his second-in-command Verges when the letter attempts to speak. His instructions to the Watch seem somewhat contradictory to the whole purpose of patrolling. His inability to get to the point holds some responsibility for the scene in the church. By his own report, he is an officer, owns his own house, is rich enough that he has suffered investment losses, owns two gowns (which might be considered the equivalent of owning two very good suits), and thinks himself a fine specimen of a man. He is also old enough to call upon his years as worthy of respect.