Cat is 12 and has lung cancer (probably, no biopsy)
Slowed down over last couple of months and dramatic weightloss over last 3 weeks. No real interest in food and seems to find chewing hard but also not keen on pates or treat food blended. He is losing energy and not self-grooming.
It is time, isn't it? 
We have a check-up booked for tomorrow. He was losing a bit of weight. I can only think it will have gone down more. I can't tempt him to eat. He is lacking energy.