They ride together in the car.
But they weren't playing together. We came down to the city over the 4th. Matilda watched Stella play with a dog friend at the field in the park. Stella kept inviting Matilda to play, but she wouldn't respond. Finally, I got down on the floor with Matilda and invited her to play. Immediately, Stella and Matilda began to play. They played forever. It was amazing to see.
We hope this transfers to running together in the field in Connecticut.