Little Kittens have Wonderful Dreams

Even cats dream when they close their eyes. Their dreams are surprising, as there is no difference between a cat and a mouse, and between the strong and the weak. They are brothers who befriend and exchange opinions and advice.
The little cat in our story befriends the mouse, finds a treasure, drives a truck, and soars them in the sky.
Why did the truck fly in the sky?
Did they return to Earth?
In a dream, miracles happen.