In unspayed dogs, the first estrus cycle, or heat, usually occurs between 6 and 24 months. In smaller breeds, the first estrus is often earlier than in larger breeds.Continue Reading
A female dog's behavior changes markedly during estrus. She becomes more affectionate and may appear nervous or agitated. More frequent urination is also an indicator. A male dog is typically attracted to a female in estrus for approximately 18 days, but she is attracted for only half of this duration. When the female dog is fertile, her vaginal discharge changes from light red to straw-colored and decreases in volume.
To prevent estrus, a puppy can be spayed as early as 2 months.Learn more about Dogs
A dog will enter her estrus cycle from one to three times per year and it lasts anywhere from 2 to 3 weeks. How often a female dog menstruates and for how long is dependent upon breed. Some breeds will have an estrus cycle only once a year while others may have a cycle three times a year.Full Answer >
Unspayed female dogs tend to experience estrus, or go into heat, twice a year. Some breeds go into heat more often than others, and spayed dogs do not go into heat.Full Answer >
A poodle in heat displays the same signs of estrus as any other dog breed, including vaginal discharge and swelling of the teats and vulva. Smaller dogs may not display these physical signs as prominently as larger dogs, in part because their smaller body parts make the changes less obvious.Full Answer >
During estrus, or the heat cycle, a female cat exhibits behavioral changes such as persistent rubbing against furniture, objects and people, according to VCA Hospitals. A female becomes very affectionate and tends to seek out extra attention. She may yowl, become very vocal, roll on the floor and raise her hind quarters when stroked along her back. Vaginal bleeding may occur during the estrus cycle.Full Answer >