A rewrite of a beloved story

For generations Humanity had been thriving but all that changed when a terrorist group unleashed a deadly toxin. During that scientists created the first anthropomorphic animal which survived the toxin along with a few of their companions. Centuries went by as this new race became the dominant species after humanity went extinct, but then things changed when word goes around speaking about a human, who had survived somehow. Things have changed but will this human adjust, or will their secret get in the way?