In one dog breed, selection for utility may have selected for obesity

Labrador retrievers are common pets, but they also work as service dogs, aiding people with sight or hearing impairments. Unfortunately, the breed is particularly prone to getting overweight, and this tendency apparently is more severe in Labradors purpose-bred for service. To figure out the reasons behind this, researchers at Cambridge University investigated potential obesity genes in Labrador retrievers’ DNA.

It turned out increased obesity risk in Labradors was linked to the same genes and mechanisms that cause obesity in humans. These gene variants were more common in purpose-bred dogs we carefully selected, generation after generation, to maximize the results of the demanding training programs service animals must go through.

We thought we were picking the smartest Labradors to become guide dogs. But we might have been picking the ones that just wanted the snacks given as rewards the most.

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