
I agree, with blood testing you test from before they are likely to be ovulating and re-test every two days to watch for the rise and when it reaches ovulating levels you know.
Guessing or asking them to guess from a low reading is no more use than not testing and making a stab for it.
My two most recently mated bitches, daughter mated day 20 - 22, and mother days 16 - 18.
The first was mated on days 18 - 20 last time, and the other was mated days 15 - 17 first time and 13- 17 second time.
So both close to previous times, but some bitches can vary wildly from season to season. Will the stud dog owner not board the bitch for you, the dogs can then get to know each other well, and the bitch will be more relaxed, and your more likely to get matings at optimum times?
Barbara and the Grey Curly Tails.