Cocker Spaniel Puppy Health Issues:
Breeding and Whelping

GENERALIZATION OF A HEAT CYCLE
ESTRUS:  Has 4 stages. 
1. Anestrusis - this is the rest period between heat cycles

2. Proestrus - the first days of the cycleswelling of the vulva start of blood follicles start to mature, this can take anywhere from a few days to over a week 

3.Estrus - this is the time that   your female will accept a malea.  blood will become alight pink

b.  lifting her tail

c.  moving her tail to the side

d.  moving her rear sideways when you touch her next to her tail. (This is called Flagging)  This is the time ovulation occurs.  

4.  Metestrus - the uterus readies itself for pregnancy.  If fertilization occurs the eggs will attach themselves to the uterine wall. This might take up to a week.  If fertilization does not occur, it is back to step 1.
    One way to keep a check on this is to visually check her every day for the changes, use a cotton ball to keep a check on the color of the blood, and be willing to feel her because this is important.  She will start out, when swelling, feeling soft and full, as she continues in the cycle she will start to feel firm and hard, when the valva starts to soften is when she is starting into estrus.  You can not be timid about this.  It is part of breeding cockers.
 An old rule of thumb is
    1.  Start heat 7 days
    2.  Standing heat 7 days
    3.  Going out of heat 7 days
Granted not all bitches display this cycle.  Each bitch does her own thing.  You need to watch her closely to see how she has her cycle.
I've had one bitch that had only a three day cycle
           Day 1 coming in
           Day 2 standing
           Day 3 out.
If you didn't have her in with a male, you missed her.  And I have had one bitch that took three months to go through her whole heat.  This was normal for her.
Also, there is not set month time frame.  Some females cycle regularly every 6 - 7 - 8 months, some females cycle once a year.  Each bitch is different.  Learn to know your female.  Keep records.
    When the female ovulates, it takes around 48 hours before the eggs can be fertilized.  She can release hundreds of eggs.  Not all will be fertilized but a great number can be.  Nature usually allows for this and absorbs the unhealthy ones and even the healthy ones when there are too many for the bitch to carry to term.
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