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A 2-year-old intact male purebred Shetland sheepdog was examined. It had been mated to 4 bitches of known fertility but had failed to produce a pregnancy. Despite several attempts in various ways no semen could be obtained, although anal and urethral pulsations were evident. Semen was retrieved...

Post, K.; Barth, A. D.; Kiefer, U. T.; Mapletoft, R. J.
Canadian Veterinary Journal, 1992, 33, 1, pp 53-55