Question

Proestrus bleeding in dogs is caused due to

• A. Increase of the estradiol-17 hormone
• B. Inflammatory response of WBC
• C. Ovulation
• D. All of the above

Answer 1

The correct option is A Increase of the estradiol-17 hormone

The reproductive cycle of the non primate females is called estrous cycle. It can be divided into four phases: proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. There is bleeding found in dogs during the proestrus phase. There is increase in the level of estradiol-17 hormone. This results in the movement or diapedesis of the red blood cells in the blood vessels which causes bleeding.

Thus, the correct answer is option A.