it was a dog
Animals were the first living thing in space.
a dog called Laika was sent to space
The first thing sent into outer space was a satellite
the first thing is go to space is satellite
The first living thing deliberately sent by humans into space was the dog Laika (a stray taken from the streets of Moscow) aboard Sputnik 2 which was launched on November 3, 1957.
The first thing sent into space was the Nazi Germans V-2 rocket in the Second World War.
Cosmologically speaking, the first thing in space was the Big Bang. If you meant to ask what was the first thing sent by humans into space, that was a Russian satellite called Sputnik.
Explorer 1, a small space probe.
A dog (although it's possible mice had been sent on earlier Soviet missions)