TL;DR: Swollen and hot testicles in dogs are a high-priority medical emergency that requires immediate veterinary attention to rule out life-threatening conditions like testicular torsion or severe infection.
Why are my dog's testicles swollen and hot?
When a dog's testicles become visibly enlarged, firm, or hot to the touch, it is usually a sign of significant inflammation or a vascular issue. This condition is most commonly diagnosed as orchitis (inflammation of the testicle) or epididymitis (inflammation of the sperm-carrying tube). These symptoms can be caused by bacterial infections, trauma, or even autoimmune reactions. Because the area is highly sensitive, these conditions are often extremely painful for your pet.
Is my dog's swollen scrotum a medical emergency?
- Urgency Level: High. You should treat swollen and hot testicles as a medical emergency.
- Common causes include severe infections or testicular torsion, a condition where the spermatic cord twists and cuts off the blood supply.
- Torsion is a critical emergency that can lead to tissue death and systemic shock if not treated surgically within hours.
- Seek veterinary care immediately if your dog is lethargic, vomiting, or walking with a stiff gait.
How does sending a photo help triage my dog's condition?
- A clear, well-lit photograph allows the medical team to see the degree of swelling and any skin discoloration or bruising.
- The visual helps identify presence of discharge or visible wounds.
- This information helps the veterinarian determine the severity of the situation and prepare the necessary equipment before you arrive at the clinic.
Clinical Context (Merck Veterinary Manual)
Acute inflammation of the testis (orchitis) or epididymis (epididymitis) in dogs can be caused by trauma, infection (fungal, bacterial, or viral), or testicular torsion. Infection can be hematogenous or urologic in origin. Clinical signs include pain and swelling of the testes, epididymides, and/or scrotum, and there may be wounds or other lesions in the scrotal skin. Palpation of the scrotal contents may be difficult due to patient discomfort and edema; ultrasonography, with sedation or analgesia as needed, is helpful to evaluate the affected structures and confirm testicular torsion and focal lesions. Diagnostic tests should include evaluation for Brucella canis infection, and cytologic examination of semen with bacterial and mycoplasmal culture may also be helpful, although semen collection may be difficult. Testicular or epididymal specimens for cytology and culture may be obtained by fine-needle aspiration, while testicular biopsy for histopathology and bacterial culture may be performed if needed after less invasive diagnostic tests have been completed.
Chapter: Urology, Infectious Disease, Surgery
Source: The Merck Veterinary Manual, 11th Edition (Page 1400)