Estrus cycle and behavioral signs of dogs

Normal dogs are in estrus twice a year, usually in March-May in spring and September-November in autumn. When the bitch is in estrus, the body and behavior will have characteristic signs. It is mainly shown in the following stages.

① is proestrus. For the preparatory stage of estrus, the time is about 7 murals for 10 days. The reproductive system begins to prepare for ovulation. The egg is nearly mature, the reproductive tract epithelium begins to proliferate, the glandular activity begins to strengthen, the secretion increases, the vulva is congested, the vulva is swollen, the redness and dampness is lubricated, and the mucus mixed with blood. Male dogs often smell it, but bitches are not allowed to mate.

② is in estrus. It is the period when the most obvious signs of estrus and acceptance of mating, lasting about 6 murals for 14 days. On the outside, it continues to swell and soften, the outflow of mucus becomes lighter, and the bleeding decreases or stops. The bitch takes the initiative or stops. The female dog takes the initiative to approach the male dog, take the initiative to spoil the waist when the male dog climbs, the buttocks face the male dog, tilt the tail to one side, the vulva opens and closes, and mating is allowed. Three days after estrus, the bitch begins to ovulate, which is the best time for mating.

③ is in late estrus. The swelling of the vulva subsided, gradually returned to normal, the temperament became quiet, not allowed to become quiet, not allowed to approach by male dogs. It usually lasts for two months and then enters a period of anestrus. If you are pregnant, pregnancy occurs after the estrus.

④ anestrus. The reproductive organs enter a state of inactivity. It usually lasts about 3 months, and then enters the next proestrus.

The male dog is in estrus irregularly. during the breeding season of concentrated estrus, the testicles enter a state of active function. when approaching the female dog, the male dog smells the special smell of the female dog during estrus, which can cause excitement to complete mating.