By doing so, your vet will have a better idea as to whether there may be a problem or not.
Even if you breed your dog everyday for a week, you still need to mark the first mating as the start point for the canine gestation, for determining her due date.
Now the tricky part comes in.
Let’s say that you bred your canine daily, over a 4 day period, starting on a Monday.
On your calendar you count off 9 weeks from the Monday that she was first bred, as the starting point for her gestation period.
This is her first official due date.
However, since she was also bred on Tuesday through Thursday, you can’t really count her gestation as being past due, until she is a few days past the last breeding, which was on a Thursday.
2009 Calendar by Vertex42.com
By looking at the dog breeding calendar example, you can see that the first due date, which is in blue, is on a Monday, exactly 9 weeks from her first breeding.