Sorry this will be a 'bullet point' post, got rather a lot going on here atm
My
unqualified thoughts on what may be going on
1 Clementine had major orthopedic surgery whilst her bones were still growing. Osteoarthritis at a later stage being a real possibility
2 Osteoarthritis= discomfort= reluctance to be very active = propensity to weight gain
3 Inactivity can lead to a build up of bladder sludge= bladder sludge irritates bladder wall= inflammation and possible infection
4 Failure to fully empty bladder when urinating if it is uncomfortable to do so (because of arthritic pain making adopting the wee position uncomfortable and as sludge starts to accumulate passing wee becomes more sore). This all adding to further accumulation of sludge and worsening bladder inflammation
5 Spaying reduces metabolic rate, all neutered Rabbits can have a propensity to gain weight. Add to that the fact that most Rexes are greedy and you have the perfect storm !!
I would suggest a Rabbit savvy Vet initially focuses on whether there is significant arthritic problems going on as a result of her major surgery and if so prescribes a multifaceted approach to treatment- NSAIDs, Physiotherapy, Acupuncture, Laser Therapy.
Clementine may then be able to be more active .
Is she a free range Rabbit ?
Not sure what her exact diet is and if she tends to eat her share and a fair bit of Atticus's too ?
Will be back later.........................
ETA- I Recommend Mark Rowland too. He saved the lives of 2 of my previous Rabbits. He's a member of RU but it's many years since he had time to post
http://trinityvetcentre.com/