pytheas this thread is 3 years old, in order to get better responses from members you need to start a new thread.
Usually when neutered they will lose a bit of weight but if 3 mths later he is still losing weight you need to take your cat to the vet.
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food