Vala, HelenaSimões, P. B.2013-01-072013-01-071998Vala H, Simões PB (1998). Citologia Vaginal. Veterinária Técnica. 2/98: 30-34http://hdl.handle.net/10400.19/1415The female dog vaginal epitelium, changes from 2-4 layers in thickness into a multilayered epithelium during the estrous cycle, by ovarian hormones influence. Vaginal citology is a useful mean for determining stages of the canine estrous cycle, determining the optimal time to present a bitch to a dog for mating and diagnose several reproductive disorders (Olson et al, 1984; Thrall & Olson, 1993). In this article the autors show the methods of preparing and interpreting a vaginal smearpordogvaginal epiteliumestrous cyclevaginal citologyjournal article