My mini daschund would bleed when she was in heat. If you're not planning on letting her reproduce, spay her and it may stop.
6-7 days
Female chihuahuas typically stop giving off the scent that attracts male chihuahuas after they complete their heat cycle, which lasts about 2 to 3 weeks. This cycle occurs approximately every six months, and the most attractive scent is usually strongest during the estrus phase, when they are fertile. Once the heat cycle ends, the scent diminishes, and they will not attract males until their next heat cycle.
The menstrual cycle.
The monthly cycle of changes that occurs in the female reproductive system is called the menstrual cycle. This cycle involves the maturation and release of an egg, preparation of the uterus for potential pregnancy, and shedding of the uterine lining if pregnancy does not occur.
menstruation
Chihuahuas reproduce in the same manner as does any other breed of canine. The male and female mate and the female has puppies.
The best way to get your male and female chihuahuas from marking their territory is to have them neutered.
Menstruating is the time when a female bleeds during her monthly period, called her "menstrual cycle.
The endometrium.
no..
Ovarian and uterine
Yes. But it is important to make sure the female is the bigger one. This will lower the chance of her needing a c section.