Question

Is there a sentence fragment?

On November 3, 1957, the Soviet Union sent the first animal into space—a dog named Laika. Which had been found as a stray living on the streets of Moscow.

Answer 1

there is a sentence fragment.

Answer 2

There is a sentence fragment.

Step-by-step explanation:

The sentence fragment is: Which had been found as a stray living on the streets of Moscow. This fragment does not tell us who was found - therefore there is no proper subject of the sentence.