On average, most dogs reach puberty by the age of six months, but this can vary. You may have also heard of a dog as being "in heat" or "in season" during this time, and the estrus cycle is sometimes called a "heat cycle." Each estrus period lasts about 18 days. The same applies to the regularity of the female dog period. How Long Does A "Heat" Cycle Or Oestrus Last? The average is about every seven months. The first thing you need to know is that it is the biological opposite of a human period or menstruation. How Long Does a Typical Period Last for Dogs? The duration of a dog's pregnancy can fall anywhere from 58 to 68 days. On average, a female dog is … Female dogs do not cycle every month, but usually only once or twice a year. Do female dogs have periods? Just as the duration of a human menstrual cycle varies from person to person, every dog is different, and there can be variations among breeds and even variations from one cycle to another in the same animal. Dogs have periods for varying lengths of time, but they typically last about 14 to 28 days. There are many factors that affect the canine estrous cycle such as breed, age, health and size of the dog. The canine estrus cycle (commonly referred to as the dog heat cycle) occurs every 6 to 12 months. Some mother dogs will start producing milk days prior to whelping and some the same day. In dogs it is called heat or estrus. Male dogs will be attracted to a female dog for the full 18 days, but the female dog will only be receptive to males for about half that time. The heat cycle of the female dog has three parts and lasts about 3 weeks. Well, yes, but they are a part of what is properly called an estrus cycle. Most female dogs will have have their first periods irregularly, but the cycle tends to normalize in the first two years. While frequency varies according to breed and individual dogs, usually dogs go into heat about twice a year or every six months. The nursing period in dogs is not something that will be identically experienced by every mama dog. Dogs do in fact have periods, but not really the way we think of them in human terms. "Heat" should be considered to begin with the first signs of vulvar discharge, or when the female begins licking or paying attention to her vulva. How Long is a Dog's Pregnancy? The first part lasts anywhere from 3-14 days during which a bloody discharge and swelling of the vaginal area are usually seen. You can and should have your dog spayed if you aren’t planning on breeding them. Long term, this is better for your dog’s health. Technically, dogs don't have periods, It's called going into heat or going into season. Because sperm can survive in the dog’s uterus or fallopian tubes for 5 to 7 days, successful mating can take place during the entirety of her period. "Heat" cycles vary, but average two to three weeks for most dogs. Well, you may be surprised to find that there is no simple answer. 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