If someone calls you a dog, it’s a negative reflection on your personality.
If you are being treated like a dog, you are most likely being abused in some way. On the metaphysical level, dogs are consider to be the guards of the underworld, and for the dreamer they may be bringing up some messages from the unconscious. Finally, dogs could represent the more basic or animal parts of ourselves, and some think that they specifically represent male energy.
What Does Dog Mean In Dream?