Ditto everyone else.

Just some info - puppies dont wean from their mother until they are around 6wks old. Its actually safest to not take them to their new home until they are 8-10wks or older. As for heat seasons, most females go on heat twice a year (so roughly every 6 months). Problem is if you have more than one breeding female, then a female on heat can bring the other females on heat (this happened with our dog, she is undesexed as we are breeding her through her mothers registered breeders and they watched her for us while we moved. Their other breeding female went in season and so our girl followed even though she wasnt due for a good 6-8wks), with as many undesexed females as that girl has, Im not surprised they are on heat most of the time and churning out litters