Yep, gonna be gloom at your neighbors' house for a while. Such is the power of their affection and attachment, sometimes the death of a long beloved pet can hit harder than even human family members passing.
Well, now just remember to try to behave Pretender, so Jackie doesn't have to get out the shock collar she's bringing for YOU. (And no, she probably doesn't want to dress up for Halloween.)
Good luck to you both.