
I have mini dachsies and it is hard to see what is going on especially in the longhaired version, I was lucky that the stud owners I used were very experienced, they could tell by looking at the girls if they were too early/late or spot on time.
The males can be slightly taller so put her back legs on a telephone book, make sure that what the male is stood on isn't slippy, breeders I know keep a rubber door mat for such occasions,
If he is still missing the spot put your hand under her belly then cup her vulva in your fingers and he should then follow your fingers to the right spot, make sure you keep them together this may be for the whole tie, longest I have observed has been 45mins, or he may move off to one side and they lay down till the tie releases them.
Here at home I stand on the stairs and the dogs are on the landing, I can then see what is happening and guide the proceedings.
If the stud owner has mated this dog before she should know how he is likely to react and trained him to be handled during proceedings.when I have gone to an outside stud the owners has taken over managing everything and provided I am present my girls have been happy to go with the flow.
Hope all goes well.
I hope both dachsies have been PRA cord1 tested and have good results.