The word that could replace the blank space is Nadie.
There are more than 300 million indigenous people, in virtually every region of the world, including the Sámi peoples of Scandinavia, the Maya of Guatemala, numerous tribal groups in the Amazonian rainforest, the Dalits in the mountains of Southern India, the San and Kwei of Southern Africa, Aboriginal people in Australia, and, of course the hundreds of Indigenous Peoples in Mexico, Central and South America, as well as here in what is now known as North America.
C. Busco mi perro (you could also say “busco a mi perro”)
