ARTICLES

Although the heat cycle varies from breed to breed and in individual dogs, the average time a female dog is attractive to male dogs (or in heat) is 18 days. Most females are attracted to males for less time than that.

www.reference.com/article/long-female-dog-heat-357b5e3ffb61d59d

A dog's life cycle begins at puppyhood and spans an average of 12 years, although some dogs live considerably longer. The female dog generally become sexually mature by age one and can begin reproducing after that time i...

www.reference.com/article/life-cycle-dog-a56d86383978387a

Female dogs typically go into heat every six months, with the first heat occurring between the ages of 6 and 24 months. However, these intervals vary with different breeds and individual dogs.

www.reference.com/article/female-dogs-heat-d65452b50038add

SIMILAR ARTICLES

The heat cycle of each individual dog and breed varies, but it typically lasts 21 to 28 days. A dog is generally fertile for 18 of those days.

www.reference.com/pets-animals/long-dog-s-heat-last-9f38881236c5794e

The frequency and length of time a dog goes into heat varies by breed, but is approximately twice a year for about 18 days. Although the heat lasts this long, the female dog is typically only open to mating for about nin...

www.reference.com/article/long-female-dog-stay-heat-6fa0b24aaf33a92e

The female dog does not have a period but a heat, or estrus, cycle. During the proestrus stage of the heat cycle, the female dog bleeds, and male dogs become attracted to her.

www.reference.com/article/female-dogs-periods-d1cdff2e44e9516b

When a female dog is in heat, an intact and sexually mature male dog in the area can act anxious and aggressive towards other male dogs. He loses interest in anything except mating. A neutered male dog usually acts norma...

www.reference.com/article/male-dogs-act-female-dog-heat-d49c4dd591ceee8