Updated On June 26th, 2016
Pet's info: Dog | Pit Bull Terrier | Male | unneutered | 5 years and 3 months old
Answered By Jennifer Summerfield, DVM CPDT-KA 103
Veterinarian, Certified Dog Trainer
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I see that your dog is unneutered - one condition that can come on suddenly and be extremely painful is called testicular torsion. Basically, one of the testicles becomes twisted inside the scrotal sac, cutting off the blood supply and causing swelling and intense pain. Based on your description, I would be concerned about this possibility and would recommend getting your dog to a vet as soon as possible, since he is in a lot of distress and there is really nothing that can be done at home to help. Other possibilities would include a scrotal or testicular infection, a tumor, or even a scrotal hernia.
9Pet Parents found this answer helpful
Other Answers
Answered By Dr. Melanie, BVSc MS
Veterinarian
Dogs that aren't neutered are prone to developing tumors on the testes. He could also have an inflammation of the epididymus called epididymitis, or inflammation of the testes themselves which is called orchitis. Epididymitis and orchitis can also be triggered by infectious organisms, as well as by other conditions, including viral causes (i.e., distemper), infections associated with inflammation of the prostate (prostatitis), and inflammation of the bladder (cystitis). Your dog needs to see a vet to diagnose the problem and properly treat it. Keep in mind your vet will likely recommend castration, as that will cure inflammation of the testes and epididymus, and scrotal tumors. It will also significantly reduce the chances of prostate diseases when he is old. Take him into your vet first thing Monday.
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