Biopsies are usually live animals! Just parts of them! LOL
Anatomic pathology is sort of the in-depth study of disease progression and manifestation at an internal (ie necropsy) and cellular (histopathology, immunohistochemistry, etc) level. We are less interested in treatment and more interested on the physiologic and molecular processes behind disease. We do necropsies and biopsies, histology, etc and many are heavily involved with research esp. neoplasia. So we are the people that have the "last word" on why an animal died, plus when you have that dog with a huge tumor, and you have no idea if it is totally benign or highly malignant, or the cat with chronic GI disease that you just can't figure out, you sample it and send it to us - we tell you! We are the sort of the detectives of medicine lol. No one cares what we wear to work, we make bad jokes, think mixed mammary tumors just look really stinkin cool, and like using sharp objects