Chocolate-coloured Labrador Retrievers have, on average, 10% shorter lives than black or yellow Labradors, according to a study we co-published in Canine Genetics and Epidemiology. Ear infections and skin diseases are also more common in chocolate Labradors than non-chocolate Labradors.
We looked at the UK veterinary records more than 33,320 Labrador Retrievers through the VetCompass program. We then extracted data on death and disease from a random sample of 2,074 (6.2%) of these dogs.
Some diseases were far more prevalent in chocolate dogs. The prevalence of pyo-traumatic dermatitis (sometimes called wet eczema or hot-spot) in black dogs was 1.1%, in yellow dogs it was 1.6% of but rose to 4% in chocolate dogs. Meanwhile, otitis externa (ear infection) was found in 12.8% of black dogs, 17.0% of yellow dogs and 23.4% of chocolate dogs.
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Research in humans has suggested a link between inflammation and shorter life expectancy and lower quality of life. It’s possible that, by a similar process, repetitive inflammatory skin and ear infections in chocolate dogs create an immunological burden that effectively shortens their lives.
Breeding for colour, not health
Colour might not seem linked to health at first glance, but some connections between coat colour and disease in dogs are well established. The Piebald or “S” gene variants can increase the amount of white in a dog’s coat and lighten its eyes to blue, but also cause high rates of deafness in one or both ears.
Read more: Are you walking your dog enough?
In another example, the Merle or “M” gene variant gives dogs a pale speckled coat and often blue eyes, but has been also linked with high rates of blindness and deafness. Rarer examples include cyclic neutropaenia (“Grey Collie Syndrome”) and colour dilution alopecia.
Even when the coat colour genes themselves are not themselves bad for dogs’ health, problems can still arise when an unusual colour becomes popular. The genes for some colours may be quite rare in the population or else hidden inside a parent of a different colour, meaning breeders may be tempted to overuse dogs they know for sure either show or hide the rare gene.
This is the case for our chocolate Labradors: chocolate is a recessive trait, which means both parents must carry it. Breeding chocolate puppies from this shallower gene pool carries with it additional risks of ill health and disease.
And it’s not only physical health with has surprising links to coat colour – behaviour has been linked to coat colour too. For example, there appears to be an association between coat colour and aggression in self-coloured (golden and black as distinct from roan) cocker spaniels.
While it is not clear whether coat colour affects the widely prized personality of the Labrador, chocolate Labradors have different retinas to their yellow and black counterparts and retinal differences in various other breeds are thought to account for some behavioural differences in other breeds (for example in the chasing behaviour of so-called sighthounds, such as whippets, greyhounds and Afghan hounds).
The power of preference
Surprisingly, even if it turns out that the colour of Labradors doesn’t affect how they behave around us, there is some evidence that it may affect how we humans behave towards them. One study found people who look at photos of yellow and black dogs rate the yellow dogs significantly higher in agreeableness, conscientiousness and emotional stability.
Similarly, a study found pedestrians perceived pale-coloured dogs as being friendlier than dark-coloured dogs. Indeed, black dogs have been maligned by no less a figure than Winston Churchill, who referred to his own depression as a black dog. It is even possible that breeders may have selected the tan eyebrows of breeds such as Rottweilers and Kelpies because the contrast on their expressive eyebrows make their faces easier to read.
Read more: Do dogs have feelings?
But whatever our first impressions of a dog in a photograph, a dog on the street, or the new puppy we’ve just brought home, any dog owner can tell you that our relationships with our canine companions matter far more than appearances.
There are estimates that over 43,000 dogs are euthanased in shelters and pounds annually in Australia and evidence that 65% of owners report a behavioural reason for surrendering their dogs, often because the dogs have been poorly socialised, trained and managed. It is safe to say these dogs were not sent to shelters because of their colour.
With every generation in a breeding program, one can make only a certain number of strides. Since breeders have to take into account the many detailed traits specified in breed standards, there’s limited opportunity to also breed for traits that boost welfare and adaptability to urban environments.
Breeders could focus more on selecting for good temperament and health, but only if less attention were paid to superficial traits. After all, a dog can never be the “wrong” colour.
If you have just brought home your puppy and are in need of some puppy training tips, then this article was written with you in mind. Puppy breeds are very different from one another. Just like the old saying, a chip off the wall is rarely left alone, it applies to puppies just as much. One of the most important factors that affect the safety of your puppy is you, the puppy’s owner. The way that you interact with your puppy at a young age can play an important part in puppy training later in life.
Puppies, especially those from the mixed-breed category, have a tendency to be wary of other dogs and puppies. This is completely normal during the first six months of life but can get much worse if the puppy has no social skills, has several siblings, or if the puppies are placed with strangers. When you introduce your puppy to other dogs, make sure that they all stay still and that they are of the same gender. Also, introduce your puppy to people who are familiar with dogs and who don’t seem threatening to your puppy. Introduce your puppy to these people once they have been housebroken and the puppy has developed sufficient puppy confidence to be introduced to people on his own.
When you first bring your puppy home, you should take him out frequently so that he gets used to being held by your body and being handled. Puppy training goals include getting your puppy to understand and obey your commands, eliminating unwanted behaviors such as begging, jumping, lying down, barking, and digging in the backyard. If the puppy develops bad habits at this stage, stop training and try to take the puppy to a more appropriate location or time to be alone. Good training will strengthen your relationship with your puppy, and the bond between the two of you will become deeper than before.