Primary Hyperparathyroidism in Keeshond Dogs: Causes & Testing

Primary hyperparathyroidism (PHPT) is a hereditary disorder mainly seen in Keeshond puppies, caused by an abnormal increase in parathyroid hormone production from the parathyroid glands. These tiny glands, located near but separate from the thyroid glands in the neck, regulate calcium and phosphorus levels in the bloodstream.

In cases of PHPT, there is excessive secretion of parathyroid hormone, resulting in elevated blood calcium levels, known as hypercalcemia. This imbalance can impact multiple body systems, often leading to severe health complications, especially among aging dogs. Unlike thyroid hormone, parathyroid hormone controls calcium release from bones and its absorption into the blood.

Overview of Primary Hyperparathyroidism in Dogs

Dogs can develop two types of hyperparathyroidism: primary and secondary. Primary hyperparathyroidism is a genetic trait where one or both parathyroid glands produce too much hormone, which may be caused by tumors or gland enlargement known as hyperplasia. Secondary hyperparathyroidism typically arises from a calcium-deficient diet and is not passed down genetically.

The Keeshond breed exhibits a notably high prevalence of primary hyperparathyroidism, indicating a significant genetic vulnerability. This condition is far more common in Keeshonds than in many other breeds found throughout the United States.

Genetics and Inheritance of PHPT in Keeshonds

In Keeshonds, PHPT follows an autosomal dominant inheritance pattern. This means that inheriting just one mutated gene copy from either parent places a dog at risk. A dog carrying a single copy of this gene has around a 50% chance of developing the disease.

If both parents carry the genetic mutation, their puppies' risk increases and litters may contain a mix of affected and unaffected puppies. Because this is a dominant genetic condition, it can spread quickly through the population unless carefully managed by responsible breeders.

Interestingly, while human PHPT involves known gene mutations like MEN1 or RET, the responsible mutation identified for Keeshonds differs and has not yet been fully characterized. However, researchers have found a genetic marker associated with PHPT in Keeshonds, now used for DNA testing.

Signs and Diagnosis

PHPT typically appears in middle-aged to older Keeshond dogs. Early symptoms might be subtle, including increased thirst and urination, reduced energy, and loss of appetite. If left untreated, high calcium levels can cause serious problems like kidney damage.

Diagnosing PHPT requires blood tests confirming high calcium and parathyroid hormone levels. Some dogs are diagnosed accidentally during routine vet checkups.

Genetic Testing and Responsible Breeding Practices

Genetic testing is vital for controlling PHPT within the Keeshond breed. DNA tests can detect dogs that carry the mutation responsible for this condition. Veterinarians and breeders in the U.S. strongly advise against breeding dogs identified as carriers to reduce disease spread.

It’s important breeders collaborate with veterinary geneticists and use reputable U.S. laboratories offering these specialized tests. This effort supports healthier breeding outcomes and overall breed welfare over time.

How to Have Your Keeshond Tested

Owners of Keeshonds or dogs with Keeshond lineage should consider genetic testing to understand their dog's condition risk. Testing requires a simple DNA sample, usually collected via a cheek swab or blood draw.

For accurate results, choose accredited veterinary diagnostic labs, such as those affiliated with Cornell University or the AKC Canine Health Foundation, which provide reliable PHPT testing services for U.S. dog owners.

Summary and Recommendations

Primary hyperparathyroidism is a significant but manageable inherited disease in Keeshond dogs, caused by excessive parathyroid hormone leading to elevated calcium levels. Since the condition is passed down through an autosomal dominant gene, it can spread swiftly if not controlled.

Genetic testing is the critical tool currently available to identify carriers and avoid breeding affected dogs. Early diagnosis allows for timely medical interventions to improve health and quality of life.

Keeshond owners and breeders are encouraged to stay informed, test their breeding stock, and promote responsible breeding practices to safeguard the well-being and future of this charming breed.