It has nothing to do with Covid, except for the fact that the situation with Covid in the United States has resulted in Americans not being able to enter Spain or other EU countries. I had no one here to fly with me so that I could bring the other dog (one passenger per dog) and none of my American friends or family is allowed to come here to help me fly back to the US.
I have now found a French woman with a dual US citizenship who is willing to fly with me and we are leaving in six days. Finally.