Vostok programme it into an even higher orbit. The orbit eventually decayed, and it re-entered the atmosphere several years later. The next six launches were all of the "Vostok 1K" design, equipped with life-support facilities, and planned to be recovered after orbit. The first spacecraft launched on July 28, 1960 carried two space dogs named Chayka and Lisichka. An explosion destroyed the spacecraft shortly after launch, killing both dogs, and the mission was not given a name. The next mission, designated Korabl-Sputnik 2, was launched on August 19, 1960, carrying two more dogs, Belka and Strelka, as well as a variety of
Korabl-Sputnik 2 20 August, the day after its launch. Telemetry revealed that one dog had suffered seizures during the fourth orbit, and it was decided to limit the first manned flight to three orbits. All of the animals were recovered safely, and a year later Strelka had a litter of puppies, one of which was sent to First Lady of the US Jacqueline Kennedy as a goodwill present from the Soviet Union. President Kennedy's advisers initially opposed taking the dog for fear that the Soviets might have planted microphones in its body to listen in on national defense meetings. Strelka and Belka