- You may be looking for Dog-faced Alien.
A dog is a species native to the planet Earth. The animals were sometimes used in test flights during the early days of the space program.
The Robinsons encountered a dog on Preplanis. They supposed it was sent into space and put into suspended animation before crashing on the planet. ("One of Our Dogs Is Missing")
The Space Trader owned two dogs. ("The Space Trader")
Dr. Marvello said that his smoke screen could be used against small dogs. ("Space Circus")