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

Tips on Dealing With a Chihuahua's Heat Cycle. The good news is that most Chihuahuas will only be in heat for approximately 3 weeks. The bad news, however, is that you'll need to give them extra care and attention to ensure everything runs smoothly.

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.

www.wikihow.com/Tell-if-Your-Dog-Is-in-Heat

How to Tell if Your Dog Is in Heat. Heat, which is also known as the estrus period, is a reproductive stage that unspayed female dogs go through. During this stage her eggs mature, making her fertile and able to produce puppies. Your dog...

en.wikipedia.org/wiki/Chihuahua_(dog)

The Chihuahua's history is convoluted, and many theories surround the origin of the breed. Both folklore and archaeological finds show that the breed has origins in Mexico.The most common theory is that Chihuahua are descended from the Techichi, a companion dog favored by the Toltec civilization in Mexico. No records of the Techichi are available before the 9th century, although dog pots from ...

www.askabreeder.com/Dog_Heat_Signs_and_Symptoms

This stage of dog heat can last from 4-20 days. The average is 7-10 days. There are 3 common signs for a dog in heat during this stage: Swollen Vulva: This is one of the best ways to spot the beginning of a dog heat cycle. The swelling is a significant difference over her normal appearance.

www.answers.com/Q/How_long_do_chihuahua_dogs_stay_in_heat

Dogs are in heat for 21 days There are three distinct stages of the heat cycle. The first one is the "Proestrus" and it is during this stage the owner will often notice the bleeding from the vulva.

www.canidae.com/.../2010/07/how-to-care-for-female-dog-in-heat

A female dog in heat will be easily agitated and may pace restlessly during this time. This is not unusual, nor is the whimpering and panting. These are just some of the symptoms of her being in heat, and if she isn’t allowed to breed can be very frustrating to her and you.

www.thesprucepets.com/signs-your-dog-is-in-heat-3385379

The timing differs depending on the individual dog, the breed, and the size of the dog. The first heat is usually earlier for small dogs than large dogs. Unlike the signs you see when a cat is in heat, dogs are typically messier and do not appear to be in "pain" during the heat cycle as cats sometimes do.

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

Your dog can come into her first heat any time between 6 and 24 months. According to Webvet.com, small dogs come into heat sooner than larger breeds. Typically she will have two estrus cycles, or heats, a year, and each one lasts for between 18 to 24 days. She is likely to show signs that her heat is about to start by changes in her behavior.