In the city yes. We put them down just enough that his head can fit out. He will actually walk back and forth from window to window and he is just the right height that his head reaches the top of the window so we don't have to put it down much. he can get his head out but his shoulders are much too big.

On the highway not a chance.

Teddy does get anxious at times if the windows aren't down. He will pace and whine and will NOT lay down.