What are the four stages of a bitch's estrous cycle in the correct order?

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Multiple Choice

What are the four stages of a bitch's estrous cycle in the correct order?

Explanation:
Understanding the canine estrous cycle means following how hormonal activity and reproductive readiness change in a predictable sequence. The correct order is Anestrus, Proestrus, Estrus, Diestrus. Anestrus is the quiet interval with minimal hormonal activity and no mating interest. Proestrus comes next, marked by preparation for mating—vulvar swelling and discharge—and the female is not yet receptive. Estrus is the heat phase when the female is sexually receptive and ovulation may occur. Diestrus follows, the luteal phase after ovulation, during which the body supports pregnancy if mating occurred or returns to baseline if not. This progression from a non-receptive, quiet period to pre-mating preparation, then active heat, then post-ovulation rests on clear hormonal and physiological changes, making it the natural sequence.

Understanding the canine estrous cycle means following how hormonal activity and reproductive readiness change in a predictable sequence. The correct order is Anestrus, Proestrus, Estrus, Diestrus. Anestrus is the quiet interval with minimal hormonal activity and no mating interest. Proestrus comes next, marked by preparation for mating—vulvar swelling and discharge—and the female is not yet receptive. Estrus is the heat phase when the female is sexually receptive and ovulation may occur. Diestrus follows, the luteal phase after ovulation, during which the body supports pregnancy if mating occurred or returns to baseline if not. This progression from a non-receptive, quiet period to pre-mating preparation, then active heat, then post-ovulation rests on clear hormonal and physiological changes, making it the natural sequence.

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