Yes! I have only seen it happen once to one of the Shar Pei's I take care of. I dont know much about it except she was bred like normal and then about a week later (I think 1 week...it happened a while ago so Im not positive) she started dripping again and was bred by a different stud dog at that time, and the puppies were all his not the dog she was bred to the 1st time.