What research shows
Among the most commonly dreamed animals in Western samples.
Animals
Dreaming about dogs
Loyalty, protection, or something you have trained.
The psychological reading
A friendly dog is usually read as loyalty in your life; an aggressive one as loyalty betrayed or a boundary being guarded too hard.
What tradition claimed
Barking dogs warned of enemies; a friendly dog promised a faithful friend.
Included as cultural history. Traditional dream books are frequently ominous and have no predictive value.
What to do with a dream like this
Write it down before you move. Dream recall collapses within minutes of waking, and the details that vanish first are usually the ones carrying the emotional weight.
Note how it felt, not just what happened. The same image arriving as comfort and as threat are different dreams, and no dictionary can tell you which one you had.
Then look at the last two or three days rather than at your whole life. Dream content tracks recent waking concerns more reliably than it tracks anything else — that is one of the few findings in dream research that holds up consistently.
When a dream is worth more than curiosity
Recurring nightmares that disrupt sleep, or dreams that leave you afraid to go to bed, are worth mentioning to a doctor. Frequent nightmares are associated with PTSD, some medications, sleep apnoea and untreated anxiety — all of which are treatable, and none of which a dream dictionary addresses.
Before you look anything up
How the dream felt matters more than what was in it. The same image can arrive as comfort or as threat, and that difference tells you more than any entry in a dictionary — including this one.