Canine Superheroes: Laika

Laika was a Russian space dog that became the first living creature from Earth to enter orbit. She was found as a stray wandering the streets of Moscow. Originally named Kudryavka, she was renamed Laika after her breed type. After undergoing training with two other dogs, she was selected to be the occupant of the Soviet spacecraft Sputnik 2 and was launched into space on November 3, 1957.

Laika died a few hours after launch from stress and overheating, likely due to a malfunction in the thermal control system. The true cause of her death was not made public until decades after the flight.

It was not until 1998, after the collapse of the Soviet regime, that Oleg Gazenko, one of the scientists responsible for sending Laika into space, expressed regret for allowing her to die: "The more time passes, the more I'm sorry about it. We shouldn't have done it... We did not learn enough from this mission to justify the death of the dog." (Source: Wikipedia)