When an adult Chihuahua is not spayed, she will have regular heat cycles each year. This is the stage in which the dog is ready to be bred. Your Chihuahua may not experience all of these, or they may not be obvious to detect, but she will likely experience most of them. Like people, every Chihuahua is different. However, most Chihuahuas experience a heat cycle every six months or every nine months.
Female dogs and female humans may have some things in common but when it comes to menstrual cycles there are differences. Knowing what to expect with your female dog as it ages can help you differentiate between what is normal and what may be a problem. Menopause occurs in human women when they stop having a period due to the lack of the production of hormones. These hormones are called estrogen and progesterone. Menopause normally occurs in women after they reach the age of 45 but can vary from person to person. Once a woman has not had a period for a year they are said to be going through menopause and after menopause, a woman is not able to get pregnant naturally. Women who have gone through menopause do not get their periods.
How Do I Know When My Female Chihuahua is in Heat?
Although these are purebred dogs, you may still find them in shelters and rescues. Remember to adopt! Chihuahuas love nothing more than being with their people — even novice pet parents — and require a minimum of grooming and exercise.
Chihuahuas remained a rarity until the early 20th century, and the American Kennel Club did not register a Chihuahua until An analysis of DNA from the genome of domesticated dogs indicates that they entered North America from Siberia for 4, years and were then isolated for the next 9, years. After contact with Europeans, these lineages were replaced by Eurasian dogs and their local descendants. The pre-contact dogs exhibited a unique genetic signature that is now almost gone. Chihuahuas are the smallest breed recognized by some kennel clubs.