Some species of animals were either brought back through De-Extinction or were genetically-engineered in order to survived, to become good pets, etc. in 2020's-2200's.
A group of scientists had brought the famous thylacine back to life through De-Extinction in 2030's, and many were reintroduced to Tasmania, while some were favored as pets due to some of their similarities to dogs (behavior, size, etc.) and thylacines became popular pets, also the most popular (along with dogs).
While wild tigers are still currently endangered, the pet tigers, created in 2040's by a group of scientists, are becoming popular pets, and their population exploded due to their popularity. They resemble their wild ancestors, but are smaller, more peaceful, and less aggressive than endangered wild tigers. Pet tigers are not the only animals modified to be pets, foxes, coyotes, jackals, African wild dogs, lions, black bears, grizzly bears, jaguars, leopards, cheetahs, snow leopards, clouded leopards, servals, ocelots, bobcats, lynx, spotted hyenas, striped hyenas, mongooses, lemurs, and monkeys (including spider monkeys, squirrel monkeys, colobus monkeys, and macaques) were also altered to be smaller (optional), peaceful, and less aggressive than their ancestors.
Some manufacturers in 2040's had invented artificial-intelligent robotic cats that acts as spies to track down terrorists or criminals. They have video recorders in their eyes to videotape on what had happened. They are most commonly used for police investigations and spying on enemies, but can be used as pets for owners who don't have enough money for real cats.
People had problems on losing their farm or pet pigs, so in 2040's, the group of scientists had used Genetic-engineering to create pigs that glow in the dark, allowing people to find their pigs just in case if they get lost. The Glow-Pigs also have higher amount of protein, vitamins, and lower calories & fat.