Laika

Laika was a dog who lived in the 1950s, the early age of satellites on Earth, the Soviet Union "space dog" Laika was sent into Earth orbit in the satellite Sputnik 2.

According to one account, Laika died in space. The Third Doctor and Sarah Jane Smith buried Laika on Quiescia. (PROSE: Alien Bodies)

According to another account, Laika was rescured by an alien entity and given human level of intelligence and human voice (taken from cosmonaut Marinka Talanov), and encountered by the Sixth Doctor and Peri Brown. (AUDIO:  The Space Race)