In short, no, female dogs do not have periods in the same way that human females do. While mammals of all sorts — including dogs and humans — share the same basic reproductive organs, the ways those organs function is not similar. read more
Dogs do not have periods, they have estrus cycles, commonly referred to as coming into heat. Estrus in an unspayed female dog occurs once or twice a year. While humans go through estrus every 28 days, dogs’ cycles usually take approximately 180 days. read more
Unspayed cats and dogs will have a period – or more correctly – come into heat. In female dogs, at the onset of heat, the vulva becomes quite swollen and will bleed. Some bitches bleed so much they will leave spots of blood all over the house. Others bleed so little you would hardly notice it. This portion of the heat will last for up to 3 weeks. read more