According to Asian dream books, a rat has positive associations, but in our region of the world, the dream about a rodent is not well associated.
This is due to the tradition in which these animals have negative symbolism: they always harmed the farm, spread plague and stole food.
What Does Dreaming About Rat Mean?

Running rat
A dream of a running rat may herald a great love from which we are unconsciously running away.
But it can also be a reflection of the anxiety and the threat that have crept or creep into life – this translation is from old Egyptian dream books.

Rat in the house
Such a dream is a sign of changes. Unfortunately, they can be both positive and negative. Much then depends on the context in which the rat dreams.
Many rats can testify to the arrival of fat days – they are symbols of wealth and abundance. One rat in a house, according to some dream books, is a sign of upcoming family disputes.

White rat / black rat
The color of the rodent we see could make a difference in explaining the dream. The black rat has bad connotations – it is associated with betrayal, a trick that must be prevented.
The white rat is a positive prophecy – it portends unexpected help from someone we do not suspect of such will. It can even be a symbol of friendship with this person or an announcement of a ceasefire with him, that is, reconciliation, clarification of old disputes.
The rat that attacks
It means that the dreamer has to rise to the occasion: take up the challenge, solve the problem that has been haunting him for a long time.
Someone who is attacked by a rat in a dream must get rid of fear, often hidden in the subconscious.
That is why it is worth to gain self-confidence after such a night and not to hesitate with every move.
Dead rat
The sight of a dead rat foreshadows difficulties in making a decision, but it is also a signal that someone may be making the dreamer act against himself.
Therefore, if it turns out that after a dream about a dead rat comes the time for important decisions, you must make them in accordance with your conscience, and not under the pressure of others.
Some dream books translate the dream of a dead rat as information about a threat that has passed.
A rat that bites
To be bitten by a rat in a dream is to fall into a hole you have dug or to lose something as a result of your own zeal.
A bite can also foreshadow a false accusation or a long and hard competition.

See a rat
It is seeing false friends around you.
To sum up, a rat, according to dream books from Asia, e.g. in China or India, has good connotations, but in our region of the world the dream about a rodent is not well associated.
This is due to the tradition in which these animals have negative symbolism: they always harmed the farm, spread plague and stole food.