The vet didn't acutally say "biopsy" ... he said ... "tissue sample" ...
Dulsey's had chronic difficulties; it took months to clear the nasal infection and now that that is clear it turns out that another problem we thought related may not have been... and so he's looking into IBS (or Irritable Bowel Syndrome) and other such things. For all we know she's allergic to the food color into the cat food the other guys have been getting for years...