title: The erect dog penis: a paradox of flexible rigidity.
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000502:physiology; D003307:Copulation; D004285:Dogs / Q000502:physiology*; D004542:Ejaculation; D005205:Fascia / Q000502:physiology; D005260:Female; D007314:Insemination; D008297:Male; D009132:Muscles / Q000502:physiology; D010413:Penis / Q000033:anatomy & histology / Q000098:blood supply / Q000000981:diagnostic imaging / Q000502:physiology*; D011312:Pressure; D011859:Radiography; D012039:Regional Blood Flow; D012611:Scrotum / Q000033:anatomy & histology; D012726:Sexual Behavior, Animal; D014621:Vagina / Q000502:physiology; D014680:Veins / Q000502:physiology