There is a dog on a spaceship. He is surrounded by aliens. The aliens are staring at him.
There is a dog in an alien spacecraft.
Why is there a dog in a spaceship?
We found it tethered to an inferior life-form.
scene: a UFO description: There is a dog on a spaceship. He is surrounded by aliens. The aliens are staring at him. uncanny: There is a dog in an alien spacecraft. entities: Extraterrestrial_life, Dog. caption: We found it tethered to an inferior life-form.
The inferior life-form the aliens are referring to are humans: usually, dogs are seen as leashed by humans, but from their outside perspective, the dogs and humans are equally tethered, but the dogs are superior. It's a light-hearted reference to the idea that even aliens would like dogs a lot.