http://www.petchidog.com/chihuahua-heat-cycle

When a female dog does have her first heat cycle, this means that she has entered puberty. If a Chihuahua does not enter her first cycle by the age of 12 months, ...

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

It's important to note that all Chihuahuas are different, and unfortunately there's no easy way to tell exactly when your Chihuahua will have her first heat cycle.

https://pethelpful.com/dogs/How-to-Breed-Chihuahuas

Mar 16, 2018 ... This means that some Chihuahua dog owners may actually miss their Chihuahua's first heat cycle simply because Chihuahuas are fastidiously ...

https://www.youtube.com/watch?v=t1TMwfLiRzs

Dec 3, 2013 ... chihuahua in heat!!!!! behaves strangely!!!! alessandroz75. Loading... Unsubscribe from alessandroz75? Cancel Unsubscribe. Working.

https://littledogtips.com/all-you-need-to-know-when-your-dogs-in-heat/

Jan 30, 2017 ... Your dog's first heat cycle will occur when she's between 6 months to 2 .... I'm afraid to get her spayed because so many dogs in my chihuahua ...

https://www.akc.org/expert-advice/dog-breeding/when-dogs-in-heat/

Jul 30, 2015 ... Although six months old is the average age of a dog's first heat, this can vary ... Female dogs cycle into heat on average every six months.

https://www.akc.org/expert-advice/dog-breeding/how-long-are-dogs-in-heat/

Jul 30, 2015 ... Some giant breeds may not go into their first heat until they're 18-24 ... Early in the cycle, a female dog may not be receptive to male dogs, ...

https://animals.mom.me/information-on-the-menstrual-cycle-of-a-chihuahua-12217097.html

Sep 26, 2017 ... If you are a Chihuahua owner or know someone with a Chihuahua, then you ... the state of Chihuahua in Mexico where it first became widely-recognized as ... The estrus cycle of a Chihuahua consists of four stages: proestrus, ...

https://www.banfield.com/pet-healthcare/additional-resources/article-library/conditions-illnesses/is-my-dog-in-heat

Each time your dog goes into heat, the cycle will last about 21 to 28 days. However, each dog is different, so at what age her first heat cycle starts and how long ...

https://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. ... Your dog can come into her first heat any time between 6 and 24 months.