What was the name of the dog sent into space?

Answer 1

If you mean the dog on Soviet craft Sputnik 2, launched on the 3rd of November 1957, her name was Leika/Laika.

It was a one way trip for her though, as once all the experiments of the mission were complete a radio command was sent from the ground to vent the air from the capsule. She died quickly.

She was a stray and adopted by them and after a well deseved care that she was longing, they sent her up in space and left her there alone to die in orbit. Saddest story I ever heard to be honest. To be given hope of a new life and then just left to die on purpose