Dimension Door says:
Opening a door that bypasses normal space, you instantly transport yourself and any items you're wearing and holding from your current space to a clear space within range you can see. If this would bring another creature with you—even if you're carrying it in an extradimensional container—the spell is lost.
For balance reasons I can understand not being able to bring your allies with you, but Animal Companions and Familiars (especially for Witches) are an integral part of the character.
I was searching for an exception that says something along the lines "your minion is only a creature when you want it to be", but I could not find any.
Is there any way a Witch can bring their Familiar along?