Two dogs in two different automobiles.
Two dogs poked their heads out and growled at each other.
They just don't know who they are.
Those dogs are talking to each other.
They're saying, "Hello, goodbye."
They're smiling at each other.
They're saying, "Our car can go faster than yours can."
We're giving them credit for knowing they're in a car.
They look like friendly dogs.
Maybe they had a lengthy conversation.
They're saying, "Where are you going, I'm going here," etc.
The drivers cut each other off, so they're looking at each other.
There's a string on the dog that's caught in the window.
Not being a dog, I wouldn't know what they're saying.
They're saying to each other, "Nice to see you again."