Perpetual Breeding/Whelping Date Chart
This is a chart that gives an idea of when a litter may be expected after a bitch has been bred. It is based on the average 63 day time period between the mating and birth of puppies. However, it is wise to prepare for the whelping at least a week in advance, because puppies may be born with a good chance of surviving as early as 58 days after the mating. The longest time after mating until birth is considered to be 72 days, but I personally have not yet had a bitch deliver any later than the 64th day after mating in a normal whelping.
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