08/15/2026
There’s a misguided idea that if you raise and train a dog right, socialize it properly and love it enough, it will never develop behavioural issues.
But genetics don’t work that way.
Training, socialization, exercise and a good environment can have a huge impact on how a dog behaves. But they can’t completely erase the genetics that influence that dog’s instincts, temperament and behavioural tendencies.
To understand what a dog may be like as a mature adult, you need to look beyond the puppy in front of you. When possible, look at the parents, grandparents and the characteristics of the breed(s) involved.
If one or both of a puppy‘s parents are fearful or aggressive, there’s a greater likelihood that puppy will develop similar tendencies as it matures. Likewise, parents with sound temperaments typically produce sound puppies.
If you’ve ever watched a Border Collie herd sheep, you’ve seen genetics at work. Put a well-bred working-line Border Collie puppy in a pen with sheep, and you’ll likely see herding behaviour emerge with no previous training. No one taught the puppy to have that instinct. It’s there because of genetics.
And sometimes those genetic tendencies don’t show themselves right away.
A livestock guardian breed, for example, may seem like a perfectly social, easy-going puppy, only to become much more protective as it approaches adolescence or social maturity. That behaviour doesn’t appear out of nowhere. The dog simply matured enough for those genetically influenced behaviours to emerge.
That’s why starting with a puppy – whether it’s purebred or mixed, from a breeder or a rescue – doesn’t automatically guarantee you’ll end up with a dog without behavioural problems.
And it’s also why some dogs can have a very poor start in life, with little or no socialization and all the behavioural problems that can come with that, and still develop into solid, stable dogs with the right environment, training and support.
Appropriate socialization, training and management matter enormously. They can help a dog become the very best version of itself.
But they cannot turn every dog into something it was never genetically designed to be.