Sonia said:

"Rex rushed out with what little power he had left and pounced at them when they entered the room where my nephew was hiding in the closet because he realized my nephew was in danger. Sadly, Rex was shot four times before ultimately giving up the fight.

"The sirens were what drove them away. To the last ounce of strength he had left, my nephew was shielded by his steadfast buddy, encouraging him to follow his instincts of love and loyalty.