Vierthof Mating Cycle of a Bitch

**This cycle may vary due to many factors, but the above is a reasonable approximation**
Day	External Signs	Internal Signs

-5	Appetite increases	Reproductive organs
-4	Vulva swells	become congested
-3
-2
-1
1	Discharge bright red at first,	Hundreds of follicles
2	turning to pink and finally to	develop, but only a few
3	very light cream colour.	reach the surface of the ovaries
4		to be released at ovulation.
5
6
7
8
9	Bitch begins to show interest in
10	males.
11	Acceptance period, during
12	which bitch will mate.
13
14		Ovulation begins
15
16		Ovulation period
17
18		Ovulation ceases
19	Male interested but bitch	Fertilized ova move down
20	hostile	Fallopian tubes