In a lineup, it may be difficult to pick out two puppies from the same litter, or identify a puppy's mother and father. Like humans, dogs may resemble their parents and their siblings, but also can exhibit some characteristics that even a good shake of the family tree might not explain.
The Skinny on Genes
All species have a genetic makeup, which is passed along from both mother and father. Take the black dog, for instance. Most dog lovers, advocates and rescuers are aware of the onslaught of black dogs seeking homes on a daily basis. There is a genetic reasoning for this. Black is the dominant gene. When a mother with a black coat is bred to a father of the same, the likelihood is the offspring will be black in color, unless both parents carry a recessive gene, such as a liver color. If both parents pass the recessive gene, the offspring will be liver colored, but the most likely result is a litter of black puppies. Recessive genes can lay dormant for years, and may reappear generations later.
Based on a study conducted by the University of California, Berkeley, the passing of specific traits responsible for the appearance of puppies is far more predictable when the parents are purebred. Mixed breed puppies are more likely to take on characteristics of both parents, and the likelihood that all puppies will look like the parents and their siblings, is far more slim. This research is supported by the introduction of such crossbreeds such as the labradoodle. All labradoodles are similar in appearance, but finding two who look exactly alike may be little more than coincidence.
Below the Surface
Every puppy owner wonders what his adult pup will look like, but there are far greater considerations when looking at characteristics and genetics. While an adult male or female may not pass along their adorable ears to their offspring, they may pass along something far more brooding. Hereditary disease is a concern for all dog lovers, and some breeds are simply far more likely to inherit disease and medical issues from their parents. The Kennel Club now encourages all breeders to health test their breeding partners, but there is no guarantee they will do so.
The Dog in the Mirror
In the world of certainties, it's proven that the adorable puppy waddle will disappear over time, and as the pup grows, he may or may not resemble his parents. Despite studies of canine genetics, no one person can be absolutely sure how a puppy will develop or change as she ages. Far more important to the average dog owner is making certain his puppy grows up to be a healthy and well adjusted adult dog. Ongoing veterinary care is essential to ensure this will happen, and if rumor has it, your dog just might end up resembling you.
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