Colloquially it's called "heat", the medical term is oestrus (pronounced and sometimes spelled without the o).
Technically it's not quite the same as a "period," the bloody vaginal discharge exhibited by some dogs is not menstruation, and occurs before, rather than after, ovulation.
Depending on the breed, heat cycles usually happen about twice a year.
She is said to be "in season."
A Male dog is called a Dog, and a Female dog is called a Bitch.
A Male dog is called a Dog, and a Female dog is called a Bitch.
A male is just known as a dog and the female is a bitch
A female dog in Spanish is called perra. In the English language a female dog is referred to as bitch which is a term that has been misused.
it is called a female dog
One female dog - une chienne female dog - chienne
Yes. All female mammals have periods.
it is called a female dog
A castrated female dog is called a spayed bitch
If it is a female it might be having its period.
They are called dog, bitch and pup.
As long as it is not a female dog it is. Male dogs are called "Dogs". Female dogs are called "Bitches". See the related questions "What is a dog when it's not a dog?" and "Is my dog a dog?" for more information on these interesting questions.