TL;DR: Blood dripping from a dog's penis indicates a urogenital issue such as an infection or prostate problem and requires a prompt veterinary exam; seek emergency care immediately if your dog is unable to pass urine.
What does it mean if my dog is bleeding from his penis?
- Finding blood dripping from your dog’s penis is a sign of an issue within the urogenital system.
- Common causes include urinary tract infections (UTIs) and bladder stones.
- Issues with the prostate gland are frequent causes, especially in unneutered males.
- Bleeding can also result from local trauma, tumors, or blood clotting disorders.
Is my dog bleeding from his penis a medical emergency?
- Medium Urgency: If your dog is acting normally, eating, and successfully passing urine, schedule a veterinary appointment for the same day or the next morning.
- High Urgency: If your dog is straining to urinate but producing nothing, this indicates a potentially life-threatening blockage requiring immediate emergency care.
How can taking a photo or video of the bleeding help the veterinarian?
- A clear photo or video provides a visual record of the exact color, volume, and frequency of the bleeding.
- It helps the vet determine if the blood is bright red (fresh) or darker (older).
- Visual evidence aids the veterinary team in making a faster and more efficient diagnosis during your visit.
Clinical Context (Merck Veterinary Manual)
In dogs presenting with bleeding from the penis, potential causes include balanoposthitis, penile trauma or lacerations, neoplasia, foreign bodies, urinary tract infection, urolithiasis, phimosis, and prostatic diseases such as benign prostatic hyperplasia (BPH). Abrasions or lacerations may bleed during breeding, resulting in blood in the semen. Priapism, a persistent erection without sexual stimulation, can also cause bleeding and may be caused by myelopathy, drugs, vascular abnormalities, penile masses, or trauma. Examination should include thorough evaluation of the penis and prepuce to the level of the fornix, as well as digital palpation of the prostate per rectum. In cases of severe necrosis or gangrene, amputation of the penis and prepuce with urethrostomy may be necessary.
Chapter: Urology, Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 1401)