To assess the efficacy and safety of a combined cabergoline and cloprostenol protocol to terminate third-quarter pregnancy, 22 pregnant bitches that ranged from 35 to 45 days after mating were randomly assigned to a treatment group (n=13) or to an untreated control group (n=9). The animals were monitored for 12 days, and pregnancy termination was confirmed by ultrasound examination. Twelve of the 13 treated bitches aborted within 9 days of the initiation of treatment (mean 4.6 days). Only mild side effects were observed. The control animals had normal gestational courses, as did the bitch that did not respond to the therapy. This combination of drugs appeared to be a practical, safe, and efficient abortifacient when used in third-quarter pregnancies.

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