Figure 3

Histological examination (normal dog: (a), (b), dog 1: (c), (d) and dog 4: (e), (f)). (a), (c) and (e). Hematoxylin and eosin staining. (b), (d) and (f). Masson's trichrome staining. Black arrow indicates hemorrhage in the lumen of the anus and asterisks indicate hemorrhage in the submucosal tissue. White arrows indicate venous congestion in the spincter muscle layer. Black bar = 1 mm.