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In fact, due to my lack of paying enough attention I had two accidental litters in the last year or so. One litter is about a year old and the other is 5 months.
There is your problem
Murphys law.......You want them bred and they wont have pups......when you don't want them, they will have 15 fat healthy puppies in the mud under the barn! LOL
I have terrible luck in breedings dogs so I am no help.
I would guess, you could really only know the answer with the progesterone testing. It's my understanding they have to be tested every day in cycle to get what you need. Depending on availability to a vet it can make it inconvenient.



