A popular example of a brand community is the ______________…

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Nоw, cоnsidering the sаme bitch, with а different histоry. A 4 yeаr old Pomsky bitch came to the Theriogenology section at Mizzou for a pregnancy exam one month after natural cover. Her estrus was monitored using progesterone concentrations and vaginal cytology and the natural breeding happened on day 4 after LH surge. She was naturally cover once by a proven stud dog. The "tie" lasted 55 minutes. Report on vaginal cytology collected on the day of breeding showed 100% superficial cell index, small number of red blood cells, no white blood cells present, large amount of bacteria. Abdominal ultrasound performed (30 days after mating) and showed the presence of only one fetus (singleton). Considering this new scenario, what is the most likely cause of a single fetus?