My stud just bred with 2 different females, who are now both bleeding abnormally. Do you think they're ok or might there be some sort of STD?

I have no idea if I am asking this question in the right place or not. I read all of your questions and answers on your website, but my question was not asked or answered.

I have 2 females that my stud has breed recently. One was picked up two weeks ago and her owner informs me she is still bleeding a lot. The other was just picked up today on her 16th day of her cycle and they also called and said that their dog is bleeding a lot.

I take my dog in every couple of months and have him tested for sexually transmitted diseases, but I am wondering if all this bleeding is normal. My dog is not bleeding. But the females are. Usually after day 16 there is hardly any if any bleeding. Are these females in trouble?

Kim