
how do you know he ejaculated inside her?
If she has got a stricture, it will need correcting. It's not a common thing, but is a fairly minor procedure to correct it, that will need to be done by your vet. :)
If there is a stricture, the dog wouldn't of been able to enter her & fully extend & she would have been in discomfort.
Are you sure he isn't just mating her & not tieing?
Lots of dogs conceive through matings with no tie.
Why not pop her to the vet & ask him to check her, he can do an internal & tell you if everything is ok or if there is a stricture.
Hope this is helpful & good luck with your bitch. :)