There is a book which is brilliant for bitch owners taking you through the process J M Evans AND Kay White called
"THE BOOK OF THE BITCH"
"THE BOOK OF THE BITCH"
Progesterone Testing I recommend that bitches coming to my dogs are progesterone tested prior to mating
Bitches can ovulate anytime from Day 9 to Day 28 so it is beneficial to be sure rather than guess "around day 12"
The vets will offer you a swab test or a smear test but I have found that progesterone blood tests are more accurate
To carry out a blood test these are the options I would recommend:
Google a local Fertility clinic near you and they will do the test and give you the results within an hour
Clinic below will give results within half an hour
Amy O'Mallly (based in Harpenden)