Abstract
A female 13-year-old Shiba showed dysuria due to a peritoneal mass compressing the bladder. After the mass was removed, urination was readily induced by manual compression of the bladder, although urination was incontinent for 1 month. The animal was under a good condition for 7 months after treating with distigmine bromide. The mass was diagnosed as uterine leiomyosarcoma appearing probabley in relation to hystero-oophorectomy performed 3 years before.