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Phases of a Dog’s Heat Cycle. A female dog’s reproductive cycle is called an estrous cycle and is broken down into three different phases: Proestrus is the beginning of the heat cycle. It’s characterized by swelling of the vulva and a blood-tinged vaginal discharge. Female dogs will not allow mating to occur in this phase.
To use our dog heat cycle calculator, you only need to enter the first day of the last female dog cycle. If you keep track of your dog's heat cycle and know her cycle's length, you can also enter it. The calculator will give you: The predicted duration of this cycle; A predicted range of dates when the next heat cycle should happen.
Females attract and accept males. Ovulation occurs during this time, usually 2 to 3 days after mating. Diestrus. The period 10 to 140 days after heat, when the dog is either pregnant or in a resting phase. Anestrus. The resting period between diestrus and the next heat cycle.
On average, a female dog will come into her first heat between six and 15 months of age. However, toy and small breeds mature much earlier than giant breeds and can come into heat as early as four months of age. Giant breeds might be two years old before they experience their first heat.
The heat cycle of a female dog has four stages: proestrus, estrus, diestrus, and anestrus. Signs that a female dog is in heat include bloody discharges, a swollen vulva, tail flagging, male interest, and mood changes.
Understanding your dog’s heat cycle (or estrus cycle) is paramount if you have an unspayed female at home. Without learning how it works, it is impossible to know what is normal and what...
When female dogs enter puberty, they begin to have estrous cycles. The estrous cycle consists of four distinct stages. What most people refer to as “coming into heat” or “coming into season” refers to the stages called proestrus and estrus.
Our dog heat cycle calculator pinpoints where your dog is in their estrous cycle, calculates the dates for the next stages, and lets you plan for their coming heat cycle.
When does a female dog have her first estrous (heat) cycle? Female 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.
Understanding a female's heat cycle can help you prepare for a breeding or prevent an unwanted litter. Find out how the heat cycle works and how to recognize when a female is coming into season.