Some doctors just have it. When I first went to AMC over 20 years ago, my Pedro was looking terrible. The test came out negative for psticosis but the doctor said that he thought the had it because of his liver enzymes (or something like that). He gave me the proper medication and he gave me enough to give my other birds (I had 6 cockatiels at that time) because he worked with me with regards to money and ability to cure the birds

It worked and all my birds were fine. Vets don't d that now.