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breedingbusiness.com/stages-of-the-dog-heat-cycle

First stage of the coitus between a male and a female dog. The Oestrus Stage — Mating. Oestrus is the next stage, also lasting around 9 days, where eggs are released from ovaries and the oestrogen levels decline while progesterone levels rise.

www.askabreeder.com/Dog_Heat_Signs_and_Symptoms

This is the fourth and final stage of the dog heat cycle when your dog is normal. This stage last about 60-90 days, at the end of which, the entire heat cycle starts again. In conclusion, pay attention to your dog. Watch her dog heat signs. Know where she is at all times to prevent unwanted suitors from mating with your dog.

www.animalwised.com/dog-heat-cycle-stages-and-symptoms-808.html

This article explains the heat cycle in a female dog, how long it lasts and at what moment your pet is fertile. We will also take a look at some hormonal changes that can cause aggression, whining, or general discomfort. Read on to learn everything about dog heat cycle stages and symptoms in this AnimalWised article.

pets.webmd.com/dogs/how-tell-if-dogs-heat

Estrus, or heat, is the stage in a female dog's reproductive cycle during which she becomes receptive to mating with males. At this time, estrogen levels first increase and then sharply decrease, and mature eggs are released from the ovaries. Ideally, your dog should be spayed before she enters her first heat cycle.. When Does A Dog Experience Her First Estrus?

www.vetinfo.com/stages-of-heat-cycle-in-dogs.html

The heat cycle in dogs, also known as estrus is the time female dogs can mate and get pregnant.The very first heat cycle typically occurs when the female dog reaches sexual maturity, approximately at 6 to 12 months old. However, there are larger breeds that mature later (at 18 months).

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

Ideally, a female dog should have two normal heat cycles before being bred. To prevent a possible pregnancy while your dog is in heat, keep her separated from male dogs for at least three to four weeks after the first sign of bleeding.

www.pethealthandcare.com/blog/dog-health/stages-of-female-dog-heat-cycle.html

Female Dog Heat Cycle. Every female animal goes through a period of sexual receptivity which is part of its reproductive cycle. It is extremely important for pet owners to understand the signs of heat in female dog.The onset, also known as estrus, may begin as soon as the dog steps into adolescence.

tractive.com/blog/en/good-to-know/dog-in-heat

Learn the 4 stages of the dog heat cycle 1. Proestrus stage. The first stage of the dog heat cycle is called Proestrus. This stage can last from 7 to 10 days, but many dogs experience about 9 days in proestrus. The first sign of this stage is the swelling of the vulva. This is one of the best ways to spot the beginning of a dog heat cycle.

vcahospitals.com/know-your-pet/estrus-cycles-in-dogs

When does a female dog have her first estrous (heat) cycle? Dogs will have their first estrous (reproductive or heat) cycle when they reach puberty. Each cycle consists of several stages; the stage called estrus refers to when the female can become pregnant. Often a dog that is in the estrus stage is said to be in heat or in season.

www.dogingtonpost.com/stages-of-heat-cycle-of-dog

Dog breeders are very astute when determining the stages of the heat cycle a female dog is in, but for the rest of us this can be somewhat of a mystery. Let me say first if you own a female dog and do not intend to have her bred, then do the right thing and have her spayed when she reaches the proper age.