from that of other species. The domestic bitch is a monoestrous, typically non-seasonal, polytocous, spontaneous ovulator.( Concannon , 2010)
Which means the oestrous cycle is characterized by a follicular phase with spontaneous ovulation, followed by a luteal phase of about 75 days and a non-seasonal anoestrus of 2–10 months (Schaefers-Okkens AC, 2005)
Pseudocyesis (PSC), pseudopregnancy, false pregnancy or nervous lactation is a physiological syndrome defined by similar signs to those observed during the post-partum period (Allen 1986; Nelson 1996). The intensity of these symptoms is extremely variable among bitches. The dog is the only domestic animal with a CL lifespan