Dog
Dogs represent close companions and friends. A friendly dog means support around you; a barking or biting dog hints at quarrels or gossip among those close to you. A bite reads as unexpected words from someone you trusted, and fierce barking was taken as a warning given early about what is on its way. A white dog was set down for benefactors and good news, a black one for worry and talk, and that division is the old convention.
A dog is one of the few animals people give a name to, and that comes when the name is called. So dog dreams are usually read as signals about relationships rather than money, and the key is whether the dog follows you or threatens you.
Readings by Situation
A dog following you happily
The support around you is solid. Someone nearby will answer if you ask for help — a good time to bring out whatever you have been carrying alone.
Being bitten by a dog
A sign that someone you trusted may disappoint you. If the wound was slight it passes as a misunderstanding; if it drew blood, it was also read favorably, as money following the wound.
A dog barking fiercely
A warning dream. Gossip can start where words are traded, so stay out of other people's business. Calming the barking dog means you head it off in time.
A white or black dog seen clearly
A white dog was read as a benefactor or welcome news; a black dog as a person on your mind or a circumstance being kept from you. Recall which way the dog led you and the meaning sharpens.
For people who live with a dog, these dreams often replay daily memory rather than symbolism. If your own dog appeared as itself, checking on how they are doing beats interpreting the dream.