In Dogs

Does anyone know what to do when an experienced dog (5 years old and used to the process) finds it hard to make a tie during mating even though the bitch is quite receptive and already quite familiar with the whole process as this will be her 3rd crossing and already having had to cater for a litter of 10 puppies. She's at her 20th day since her cycle started and I've been trying to cross her since day 9-11 as I have usually done with her successfully during her 2 previous cycles?
I have just tomorrow for a last attempt I guess. Need help

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