Thirty-two permanently pseudopregnant bitches were treated with the anti-prolactin drug cabergoline. They had all been ovariohysterectomised up to five months after their last season, in some cases over two years previously, when most were reported as showing no signs of the condition. The clinical signs were mainly behavioural, the majority being aggressive, and a small number were lactating. The efficiency of the cabergoline therapy was classified by the owners as ‘excellent’ or ‘good’ in 50 per cent of the cases, and fair in 36 per cent. The rate of success was markedly better than in similar cases treated with reproductive steroids. In all but one of the bitches, the plasma prolactin concentrations were basal.
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