Ana spent a lot of time around Stophie when I was traveling. Stophie (or Aristophanes) was my mothers cat. They weren't very close until my Dad adopted a stray they call Boots. Boots...is a large tuxedo. Stophie was a runt we adopted as a family in 91 in Seattle.
Stophie passed last year (about 2 months before Ana). Even though both were "spayed/neutered", I'm convinced they had come to love each other. Their bond was strengthened when my Dad adopted a stray who came around the house named "Boots"...Boots is a big tuxedo cat, and cross eyed, and in many ways thinks he's a dog. He's needy, he's grumpy (not in a cat way, more like a dog "pay attention to me NOW" way) and likes to start fights (he's territorial).
Ana was fine when I left for WDW last year, and sent her back to my parents to stay for the 2.5 weeks I was out on vacation (we always thought that was better than a kennel)...
But, Stophie (who was 22) had already passed the month before. My Mom said she kept looking for him around the house where he used to hang out (his hot pad, his fluffy pillow in front of the gas fireplace, his "step" on the staircase he's claimed since they bought the house back in 94.)...
When she came back to me, she was fine for about a week, and then started losing weight rapidly. It just happened so fast. I had actually planned to take her to the vet that week.
I am partially convinced it was depression on her part.
I still miss her. I'd welcome another kitty into my life, but she was there with me for so much. Traveling the US together (I had a Dodge Neon with split back seats, and put her litter tray in the trunk, and we traveled all over...only annoyance, she liked to try and sleep at my feet by the pedals...but more often than not she'd fall asleep in the rear window sunning herself)...