Development of the conceptus was characterised using B‐mode ultrasound in a standard size of dog (labrador retrievers, golden retrievers and their crosses; weight range 22 to 30 kg). Growth curves were established for various measurements of the conceptuses. Regression equations allowed the prediction of the expected time of parturition. Multiple regression analysis of two measurements (biparietal diameter and trunk diameter) resulted in an increase in the confidence of prediction.

The meaning of the word pseudopregnancy, as applied to the bitch, is discussed. Review of the literature shows that there is no evidence to support the theory that pseudopregnancy is caused by excess or persistent progesterone production. The condition is closely related to prolactin release from the pituitary gland, and can be treated using a prolactin inhibiting drug, bromocriptine

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