DH and I adopted two cats four years ago, a mum and daughter duo. Unfortunately the mother cat passed away last autumn, so now we have just the daughter. 99% of the time our remaining cat does not seem to miss her mum at all. If anything, the daughter cat seems to have become more happy and alive since her mum passed away.
Except when we leave the house. When we had both cats they seemed to have no problem with us going to work, or going on the occassional weekend away (when we'd get a neighbour to feed them). They didn't love being home alone, but they managed fine. Now that it's just the one cat left she seems really affected when we leave for more than a few hours. When we come home after having been out for the day she'll sprint to the door miaowing, when she used to just be fairly indifferent. Twice now we've been away for a longer priod - once for a weekend and once for a long weekend. On both occassions we've had a cat sitter come around once a day, but nonetheless the cat has made her displeasure known by pooing on the floor, something she has never done before.
We have previously used a house sitting website to find a 'live in' cat sitter when we go on holiday, and we're planning/hoping to increase our use of that. For weekends away we're hoping to find a cat sitter who can come twice a day rather than just once, so that will hopefully help too.
At the same time, we're slowly returning to the office so there will be 2-3 days a week that the cat is home alone from 8-5. Does anyone have any good advice or resources on how to help our cat overcome what seems might be a sudden-ish onset of separation anxiety? Would it help if we slowly build up our absences, e.g. by starting with half days in the office before full days (luckily we have flexible jobs where we can do this)? Any other suggestions?