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

The details of the Chihuahua heat cycle. Age, variances, symptoms, care. How long it last, when it begins, how often it will happen.

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

Contrary to what some people may believe, there are actually several different stages of a Chihuahua's heat cycle. While most owners assume there is only one,  ...

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

Mar 16, 2018 ... The Chihuahua's heat cycle duration averages 21 days and includes the proestrus, estrus and diestrus. The anestrus is basically a mostly ...

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

The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the  ...

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

Dec 3, 2013 ... Chihuahua puppy sees others playing with his toys.. you'll never believe what happens next.. - Duration: 1:38. Cheeky Chis 1,708,863 views.

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

Sep 26, 2017 ... Instead, dogs have an estrus cycle, which occurs (in small dogs like ... The estrus cycle of a Chihuahua consists of four stages: proestrus, estrus ...

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

Jul 30, 2015 ... Once estrus begins, it may take awhile for the cycle to become ... Smaller breeds may go into heat more frequently, as often as 3-4 times a year.

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

Is my dog in heat? Learn about female dog reproductive cycles and common behaviors from the pet health experts at Banfield Pet Hospital.

https://www.wikihow.com/Breed-Chihuahuas

The visible parts of the male Chihuahua's reproductive system ... During the start of the heat cycle there is a preparatory ... Mate the dogs several times for the best chances of getting the female pregnant.

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

Jul 30, 2015 ... Some dogs can go into heat as young as four months, while larger ... During the middle stages of the cycle, a female dog will actively court ...