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www.chihuahuawardrobe.com/what-to-expect-from-a-chihuahuas-heat-cycle

Anestrus - The last stage in a Chihuahua's heat cycle, Anestrus, is a cooling down period when the body and organs are finally getting back to normal. Owners won't notice any visible signs of a heat cycle when their Chihuahua is going through Anestrus. Chihuahua will have normal-sized genitals, no bleeding or discharge and regular moods.

www.answers.com/Q/What_is_the_Length_of_heat_cycle_in_Chihuahua

Chihuahua Heat Cycle Female chihuahuas' sexual reproductive organs do not fully develop until they are approximately 6 months old. However, periods may begin as early as 3 months and as late as ...

www.petchidog.com/chihuahua-heat-cycle

For toy breeds like the Chihuahua, it is not uncommon for the very first heat to be a split heat. When this happens, the vulva will appear swollen and there will be some discharge but the dog will not ovulate and the cycle will seemingly be done. Then, 1 to 3 weeks later, her body will release eggs (ovulate) and the heat cycle will finish.

www.reference.com/pets-animals/long-chihuahuas-stay-heat...

How Long Do Chihuahuas Stay in Heat? chihuahua first heat cycle female chihuahua in heat chihuahua in heat cycle chihuahua heat cycle information chihuahua dog in heat chihuahua heat cycle length chihuahua in heat behavior

www.askabreeder.com/Dog_Heat_Signs_and_Symptoms

Your dog can get pregnant during her heat cycle (or estrus). Dogs DO NOT go through menopause the way humans do. As they grow older they are less fertile, but it is possible for your older dog to become pregnant. Dogs typically have two heats per year. Each dog differs in length of heat, discharge amount, messiness, and personality changes.

pets.thenest.com/long-bleeding-phase-last-dogs-heat-4132.html

If you have a female puppy, you'll need to be prepared for her estrus cycle. It is similar to a woman's menstrual cycle except that it only happens twice a year. She can go in heat from as early as 6 months, so watch out for the signs.

www.thesprucepets.com/heat-cycle-for-dogs-3385378

The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. The estrus period length varies widely between breeds and individual dogs. The length of a cycle varies widely, even for dogs of the same breed. If in doubt, assume the longer end of the range for the cycle length.

dogshealthproblems.com/bleeding-phase-in-the-dogs-heat-cycle

The Anaestrus Phase of Dog Heat Cycle As the last phase of the heat cycle, the anestrus is defined as a resting period for the reproductive tract and usually lasts around 150 days. During this period the female dog’s body rests and then prepares itself for the next cycle.

dogcare.dailypuppy.com/normal-lengths-time-heat-cycles...

The exact lengths of heat cycles differ with every dog. While male dogs are drawn to females from the first days of their heat cycles, the females don't accept mating advances until a little time has passed. Female dogs are generally only open to mating with males for roughly half the time of the heat cycle, according to the ASPCA.

www.petpom.com/pomeranian-heat-cycle

It is much too general a statement to say that canines enter heat twice per year, because the length of the cycle can vary quite a bit. Typically it will last for 3 weeks, however any range from 2 weeks to 4 weeks is considered normal.