Merck Manual

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Priapism in Dogs and Cats


Autumn P. Davidson

, DVM, MS, DACVIM, School of Veterinary Medicine, University of California, Davis

Last full review/revision Jul 2020 | Content last modified Jul 2020
Topic Resources

Priapism is a persistent erection without sexual stimulation and is diagnosed by physical examination. Partial paraphimosis can also result. Priapism can be caused by myelopathy, drugs, vascular abnormalities, penile masses, trauma, castration in cats, or it can be idiopathic. It can be ischemic and a medical emergency. If nonischemic and no primary cause is identified, therapy with gabapentin, ephedrine, or terbutaline can be attempted. Castration is not helpful, because priapism is not testosterone mediated.

If necrosis or gangrene is severe, amputation of the penis and prepuce and urethrostomy might be necessary.

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Fractured os penis (ultrasound)
Fractured os penis (ultrasound)
Ultrasound of a fractured os penis (visible discontinuity of the os).