Tiff:
This means absolutely nothing. I can list diseases on both hands that would present the symptoms your burm had.
You can't just assume IBD. IBD is a disease with a myriad of symptoms - most of which overlap with other diseases.
The only way you are going to know what he had is by getting a necropsy done.
Wolfy already stated that the very fact that he was undernourished and dehydrated could have caused the neurological symptoms.