Cryptorchidism in Dogs

TL;DR: Cryptorchidism means one or both testicles never descended into the scrotum. If they are not down by 6 months, they will never come down on their own. A retained testicle is 13.6× more likely to develop cancer (PubMed, 2009). The only safe treatment is surgical removal of both testicles — done early, it is low-risk and curative.

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What Is Cryptorchidism in Dogs?

Cryptorchidism affects between 1% and 15% of male dogs, with a 2022 study in Frontiers in Veterinary Science reporting a frequency of 6.8% in the general canine population. A separate retrospective study covering 2015–2023 found an 8.91% prevalence in referred male dogs. About 75% of affected dogs have one testicle retained — usually the right — while 25% have both undescended (VCA Animal Hospitals). The word comes from the Greek kryptos (hidden) and orchis (testicle).

The missing testicle sits either inside the abdomen or lodged in the inguinal canal — the groin passage between the belly and the scrotum. In either location, it cannot be seen or felt from outside, which is what makes the condition easy to miss and quietly dangerous.

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How Testicles Are Supposed to Descend

In a normal male puppy, both testicles start high inside the abdomen. They travel down through the inguinal canal and settle into the scrotum within the first few weeks of life. Cornell University's College of Veterinary Medicine confirms that the inguinal canal closes at around 6 months of age — after which, descent is anatomically impossible.

The practical rule: If a testicle has not descended by 4 to 6 months of age, it almost certainly will not come down on its own. By the time the dog is 2 years old, the window is permanently closed.

The right testicle is more than twice as likely to be retained as the left (VCA Animal Hospitals). This is one of the most consistent findings across all published studies on the condition.

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Which Dogs Are at Risk?

Cryptorchidism is inherited — it runs through bloodlines. A 2022 genome-wide association study identified variants in the HMGA2 gene as a major contributing factor, with a 2024 study in PNAS linking KAT6A gene variants as well. The pattern of inheritance is polygenic (multiple genes involved) with recessive characteristics, meaning a dog can carry the genes without displaying the condition.

Small-breed dogs are 2.7× more likely to be affected than large breeds (PMC, 2022). Breeds that consistently appear in international case data include:

• German Shepherd — one of the most commonly reported breeds in veterinary case series
• Labrador Retriever — frequently documented in both India and international data
• Dachshund — elevated risk linked to body conformation
• Chihuahua and Toy Poodle — high representation in small-breed studies
• Pomeranian, Maltese, Shih Tzu, and Yorkshire Terrier

If your dog belongs to one of these breeds, checking for two descended testicles at the 4-month and 6-month vet visits is especially important. The Kennel Club of India (KCI) disqualifies cryptorchid males from conformation shows precisely because the condition is heritable.

Any dog with cryptorchidism should not be used for breeding. Even if he can still father puppies, he will pass the predisposition to his offspring.

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Why a Retained Testicle Is Dangerous

The scrotum sits outside the body for a specific reason: testicles need to be slightly cooler than core body temperature to function correctly. When a testicle stays inside the abdomen, it lives at full body temperature for its entire life. That constant heat stress changes the tissue over years — and leads to predictable, serious consequences.

Cancer Risk: 13.6× Higher

A 12-year retrospective study of 96 canine testicular tumors found that cryptorchid dogs had a 13.6× higher risk of testicular cancer compared to dogs with normally descended testicles. 54.2% of all tumors in that study came specifically from cryptorchid testes (PubMed, 2009). The VCA Animal Hospitals guidelines cite a minimum 10× risk elevation, placing the peer-reviewed range between 9.2× and 13.6×.

In retained testes specifically, tumor distribution differs markedly from scrotal testes:

Source: Multiple retrospective studies, VeterianKey

Sertoli cell tumors are particularly dangerous because they produce excess estrogen. This causes feminization syndrome — a set of signs many owners mistake for skin disease:

• Symmetrical hair loss
• Enlarged nipples
• Skin darkening and thickening
• Swollen prepuce (sheath)
• Bone marrow suppression in advanced cases

These signs appear gradually over months. If your male dog has unexplained hair loss and you have not had both testicles formally confirmed, ask your vet for an examination.

Most canine testicular tumors have a less than 15% chance of spreading to lymph nodes or other organs (VCA Animal Hospitals). But that assumes you catch them — and retained testicles produce no visible symptoms until a tumor is already advanced.

Testicular Torsion: A Surgical Emergency

Inside the abdomen, a retained testicle can twist on its own blood supply. This cuts off circulation and causes sudden, severe abdominal pain. A 2022 case report in PMC documented how torsion of a cryptorchid testicle presents with acute abdominal pain, vomiting, and collapse — mimicking other emergency conditions like bloat or intestinal obstruction.

Research shows that 36% of neoplastic (tumor-bearing) cryptorchid testes develop torsion (ScienceDirect). If your dog suddenly develops acute abdominal pain and cannot get comfortable, this is a surgical emergency. Do not wait until morning.

Ongoing Intact Male Behavior — Without the Benefits of Full Fertility

A retained testicle still produces testosterone. Your dog will continue to mark, roam, mount, and show interest in intact females in heat. If one testicle descended normally, he can still father puppies from that side — cryptorchidism is not accidental sterilization. The only thing that changes is the hidden, growing risk inside.

As retained testicles age, some shift their hormone output and begin producing estrogen instead of testosterone — leading to the feminization signs described above even before any tumor forms.

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How Your Vet Diagnoses It

Diagnosis begins with a physical examination. Your vet will feel the scrotum, the inguinal region, and the lower abdomen. A testicle in the inguinal canal can often be located just under the skin with careful palpation.

An abdominal retained testicle cannot be felt from outside. The standard next step is abdominal ultrasound, which locates the testicle precisely and helps plan the surgical approach. In rare cases where the testicle is very small or deeply positioned, computed tomography (CT) provides better detail.

One practical note: if you have adopted or re-homed a male dog without documentation of prior neutering, do not assume he is intact simply because you see only one or no testicles in the scrotum. Ask your vet to confirm with ultrasound. Many dogs arrive with other conditions such as giardia or skin infections — a full check-up at adoption is the right approach regardless.

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The Only Proven Treatment: Bilateral Removal

There are no medications, hormonal treatments, or supplements that reliably bring a retained testicle down. Surgery is the only treatment for cryptorchidism. The procedure is called a cryptorchid neuter, and it differs from a standard neuter in one important respect: it involves removing both testicles, even if only one is retained.

Why must both be removed?

1. The condition is genetic — a dog with cryptorchidism must not father offspring who might inherit it.
2. Removing both testicles fully eliminates the hormone source and closes all future risk from both sides.

Orchiopexy — surgically moving the retained testicle into the scrotum instead of removing it — is not an accepted treatment in dogs. Studies show this increases cancer risk in that testicle by up to 13×. No reputable veterinary organization recommends it.

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What the Surgery Involves

The procedure depends on where the retained testicle is located.

Inguinal cryptorchidism (testicle in the groin channel): The vet makes a small incision near the groin to access and remove the testicle. This is straightforward — similar complexity to a standard neuter, just at a different location.

Abdominal cryptorchidism (testicle inside the belly): The vet must open the abdomen to locate and remove the testicle. This is a bigger operation with a longer incision, longer surgical time, and a higher cost — but it remains a routine procedure for an experienced veterinary surgeon.

Both testicles are removed in the same surgical session.

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Recovery After Surgery

Most dogs recover fully within 2–4 weeks. For the first 10–14 days:

• Restrict activity — no running, jumping, or rough play
• Use an E-collar (cone) to prevent licking the incision
• Monitor the surgical site for swelling, redness, or discharge
• Return for a suture check at 10–14 days if non-dissolvable sutures were used

Pain medication is typically prescribed for the first 3–5 days. Some vets also prescribe a short antibiotic course after surgery — complete the full course even if your dog seems fine. Most dogs are bright and comfortable within 48 hours; full internal healing takes two to four weeks.

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Surgery Cost in India

The cost varies significantly depending on where the retained testicle is located and the type of clinic you use. Data from Vetic India (2024–2025):

Abdominal cryptorchid neutering costs more than a routine neuter because it requires opening the abdomen, longer surgical time, and closer post-operative monitoring. Vets at multispecialty hospitals in cities like Delhi, Bengaluru, and Mumbai consistently report the abdominal case range at ₹15,000–₹30,000+ when anesthesia monitoring and a two-day hospitalization are included. Always request a pre-surgical estimate that covers anesthesia, hospitalization, medications, and the follow-up visit.

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When to Act

If your dog is under 2 years old and has been identified with an undescended testicle, now is the ideal time to schedule the surgery. He is young, anesthesia risk is minimal, and you prevent years of compounding cancer risk from accumulating.

If your dog is older and has been living with a retained testicle for years, surgery is still strongly recommended. The cancer risk is higher at that point — but surgical removal remains the correct treatment regardless of age, and most dogs do very well with the procedure.

Waiting does not reduce risk. Every month the testicle stays inside the body is another month of elevated cancer and torsion risk. The sooner it is removed, the better the outcome.

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Frequently Asked Questions

Can a dog with cryptorchidism still father puppies? Yes, if one testicle descended normally and is functional. This is exactly why surgery matters — he can still reproduce and pass the genetic predisposition to every litter he fathers.

Will my dog still behave like an intact male after surgery? No. Once both testicles are removed, testosterone drops sharply. Marking, mounting, and roaming diminish significantly within 4–8 weeks in most dogs.

Is the surgery dangerous? Cryptorchid neuter is a routine procedure for experienced veterinary surgeons. The abdominal version is more involved than a standard neuter, but complication rates are low in otherwise healthy young dogs. Your vet will run pre-surgical bloodwork to confirm fitness for anesthesia.

My dog is 5 years old and has a retained testicle. Is it too late? No. Surgery is still the right choice at any age. The cancer risk is higher than it would have been at 2 years, but removing the testicle stops all further risk accumulation. Many older dogs recover well from the procedure.

Can hormone injections bring the testicle down? GnRH or hCG hormone injections have been studied, but evidence of effectiveness in dogs is poor and inconsistent. They are not a recommended treatment. Surgery remains the only reliable solution.

Why remove the healthy testicle too? Two reasons: the condition is heritable (the dog must not breed) and removing both fully eliminates hormone-driven behaviors and closes any future risk from the scrotal side as well.

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Summary

Cryptorchidism is common, genetic, and silently dangerous. A retained testicle cannot be seen, but it carries a 13.6× higher cancer risk, a significant torsion risk, and can cause feminization syndrome with hair loss and skin changes that mimic allergies. Treatment is bilateral surgical removal — effective, low-risk in young healthy dogs, and best done before age 2 to 3.

If your male dog has not had both testicles formally confirmed by a vet, that check is the first step. A calm, well-planned surgical visit to a trusted vet is all it takes to close this risk permanently.

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Sources: Cornell University College of Veterinary Medicine; VCA Animal Hospitals — Retained Testicle; Frontiers in Veterinary Science / PMC (2022); 12-year retrospective testicular tumor study, PubMed (2009); HMGA2 GWAS study, PMC (2022); KAT6A study, PNAS (2024); MSD/Merck Veterinary Manual; Testicular torsion in cryptorchid dogs, PMC (2022); Vetic India cost data (2024–2025).