Actually, the wizard would end up in the square beyond the Blink Dog as the fighter would oocupy the wizard's original square and the next nearest legal position would be on the other side. From the SRD:kjenks said:...B) Bull rush the wizard. He ends up in Blinky's square, but by the strange rules for ending up in an illegal square, the wizard is bumped to the nearest legal square. That happens to be the square that you started in.
So you woudl have the Blink Dog flanked.... for a short time..... and your wizard wouldn't necessarily be out of trouble.Accidentally Ending Movement in an Illegal Space
Sometimes a character ends its movement while moving through a space where it’s not allowed to stop. When that happens, put your miniature in the last legal position you occupied, or the closest legal position, if there’s a legal position that’s closer.
Besides, what are you doing fighting a Blink Dog? They are usually Lawful Good in alignment....