To feel neglected in your dream represents some aspect of yourself which you are not paying enough attention to. Perhaps you are overlooking something. Alternatively, it may reflect your real waking experiences of being neglected.
If you dream of a neglected child, then it suggests that you are ignoring the desires of the inner child within. You are so focused on the responsibilities of your daily life that you forget to stop and enjoy the smaller things.
To dream that a dog is neglected indicates that you are taking some of your friends for granted.