What a sad story. When Mandy died, Lacey was very nervous without her, always watching the back door she last went out. I found Missy one day, weeks later, staring at Mandys toybox, as if to say "where are you Mandy?". Heartbreaking!
When Sassy died, Missy would look for her at mealtimes. Then one week after she died, Missy was searching my bedroom, looking high and low and crying, looking for Sassy.
When Lacey died, Layla didn't want to eat at mealtime, she kept waiting for me to fill Lacey's bowl.
I honestly feel that's one of the hardest things about losing a furkid, seeing another furkid grieve over the loss.