If you really need to do the force feedings, would your vet be able to insert a feeding tube into the neck (it can be done for those who refuse to eat), and then you can mix up slurries for them. We had one foster cat who had to have that done by his foster mom, and it took a long time for him to regain his strength and appetite (he is FIV+, and was in fatty liver syndrome, was basically in organ failure, and the vet saved him. He is alive and well today after all of that, and being FIV+).

Did they test for FIP at all? I have no idea if the weight loss would be that, but I know my principal that I work for had an Aby that just would not keep weight on, and it ended up that she had FIP. She was young though, and had been bought from a breeder.

Have the vets run any other tests, just to rule out what it may not be?? Diabetes?

Hope all will come up fine.