
Hi,
My brother-in-law's GSD is doing the same thing to us at the moment - she is on day 18, and as we're checking her daily and they're following my advice has not yet been to the stud dog.
She is still losing copious colour, and is not flying her tail at all. As she's a bit of a daddy's girl anyway, my advice has been that she's not ready and if she were mine I wouldn't be taking her until she was as I feel she'd be traumatised ......... we're hoping she's just going to be a late one. :) If she doesn't appear ready, they'll get ovulation checks done at vet next season.
M.