Most dogs slow down at the food bowl eventually. Labradors, as a breed, often do not. Owners describe the same thing across the world: a dog that inhales every meal, scans the floor for crumbs, stares at the kitchen with theatrical desperation twenty minutes after eating, and will consume almost anything edible placed in front of it. For years this was written off as the breed's famously enthusiastic personality. The biology behind it turns out to be more specific than that.
The POMC gene and what it does
In 2016, researchers at the University of Cambridge studying obesity in dogs found that a significant proportion of Labradors carry a deletion in a gene called POMC, pro-opiomelanocortin. In dogs without the mutation, POMC produces two signalling molecules, beta-MSH and beta-endorphin, that are released after eating and tell the brain that the meal is done. The hunger signal quiets. In dogs carrying the POMC deletion, this off-switch is broken. The brain does not receive a clear satiety signal, so the feeling of fullness either never arrives or arrives late and weakly. The dog is not being greedy. Its brain is genuinely not getting the message that it has eaten.
How common is this mutation in Labradors
The Cambridge study found the POMC deletion in roughly a quarter of pet Labradors tested, and in a much higher proportion, around two-thirds, of Labradors trained as assistance dogs. The higher rate in working dogs is likely the result of generations of selection: trainers have long favoured dogs that are highly food-motivated, because food rewards drive learning. That selection pressure, applied over decades, concentrated a gene variant that makes food the most compelling thing in the dog's world. The trait that makes a Labrador an exceptional guide dog is the same trait that makes weight management harder at home.
What this means for weight and health
A dog that does not register fullness will eat past what its body needs, consistently, every day, unless the owner controls the portion. Excess weight in Labradors is not a cosmetic issue. Obesity in dogs puts direct mechanical load on joints, the hips and elbows are already sites of known predisposition in the breed. It worsens insulin sensitivity, increases the risk of certain cancers, strains the heart and respiratory system, and shortens lifespan. A Labrador that looks comfortably round at three may be moving with difficulty at seven. The rib test is a useful daily check: you should be able to feel each rib with light fingertip pressure without pressing hard, and without seeing them from across the room. If you cannot feel them at all, the dog is already carrying excess weight.
Managing a hungry Labrador without making feeding a battle
Knowing the mutation exists does not change what you feed, but it changes how you think about hunger signals. A Labrador begging at the bowl an hour after eating is not telling you it needs more food. It is telling you its satiety system is running on a broken signal. Feeding the dog's behaviour rather than the dog's actual caloric need is where weight gain starts.
Measured portions, weighed rather than estimated by eye, are the starting point. A standard cup measure varies by how full you fill it; a kitchen scale does not. Most commercial dog foods are formulated for an average activity level, and a Labrador that lives in a flat and walks twice a day is often not burning what the bag's guideline assumes. Your vet can calculate a target weight and a daily calorie ceiling for your specific dog, which is more reliable than any packaging guideline.
Slowing the meal down helps. Puzzle feeders, lick mats, and slow-feeder bowls spread the same portion across more time, giving whatever satiety signal the dog does produce a better chance to register before the bowl is empty. Splitting the daily ration into two or three smaller meals rather than one large one has the same effect.
Treats count. A training session that uses ten small treats is fine if those treats come out of the day's measured ration. A handful of biscuits on top of a full meal, given because the dog looked hopeful, is where the calorie math quietly breaks down. Low-calorie options, a few pieces of plain cooked carrot, a small piece of plain cooked chicken, can replace commercial treats for dogs that need strict management.
If your Labrador is already overweight, losing it requires a calorie deficit sustained over months, not weeks. Crash restriction is stressful for the dog and difficult to maintain. A gradual reduction, confirmed with regular weigh-ins at the vet clinic, is more effective and safer.
If your dog is gaining weight on a measured diet, losing muscle mass, drinking and urinating more than usual, or showing sudden changes in appetite alongside lethargy or coat changes, those are signs that warrant a vet visit, weight gain in those combinations can point to hypothyroidism or other metabolic conditions that need a blood panel to identify.