Tricuspid Valve Dysplasia in Dogs

Category: Heart
Inheritance: Autosomal recessive
Breeds documented: 2
Published sources: 3

Overview

A malformed valve on the right side of the heart can let blood leak backward instead of moving forward normally. The leaking valve places extra strain on the right heart chambers and can enlarge them. In more severe cases, fluid collects in the belly and blood flow to the lungs decreases. The effects vary with how badly the valve is affected.

Signs to watch for

Tiring more easily during activity
Breathing faster than usual
A swollen belly
Swelling of the legs

The defect is present from birth; the severity affects how obvious signs become.

When to get help Arrange a vet visit promptly if your dog develops a swollen belly or reduced stamina.

Diagnosis and tests

A heart ultrasound allows the vet to see the malformed valve and enlarged chambers. An ultrasound method called Doppler shows blood leaking back through the valve. Chest X-rays and an electrical heart tracing may provide further evidence of changes in the right side of the heart.

Breeds with documented risk

2 breeds

By breed size

2 Large

Labrador RetrieverLarge · Sporting Group
ShepradorLarge

Inheritance

Autosomal recessive
A dog is affected only if it inherits two copies of the gene variant, one from each parent. A dog with one copy is a carrier: usually healthy, but able to pass the variant on. When two carriers are bred, on average one puppy in four is affected. A DNA test can tell clear, carrier and at-risk dogs apart.
As stated by OMIA

We've gathered what published sources say about this condition, so you can talk it through with your vet. It isn't veterinary advice: you and your vet know your dog best.