02/15/2026
Glad to know there is science behind our practice - whether I knew it or not.
My introduction to epigenetics actually came from listening to a talk by Gabor Mate. In that talk he mentioned a study that completely changed how I looked at early development. He was talking about research from neuroscientist Michael Meaney, who studied mother mice and their pups.
Some mothers groomed and licked their babies a lot. Others did it less. What Meaney’s team found wasn’t just a behavioral difference the pups were literally developing different stress systems depending on the care they received.
The high groomed pups grew up with calmer, more regulated stress responses. The low groomed pups were more reactive. And the wild part is this, when pups born to low grooming mothers were raised by high grooming mothers, they developed the calm stress profile of the foster mother, not the biological one. The DNA didn’t change. What changed was how the genes were expressed.
Early care acted like a biological switchboard, tuning the nervous system during a critical window of development.
That idea lands very differently when you’re breeding dogs. It suggests that the early weeks aren’t just about keeping puppies alive and warm, they’re shaping how those pups will experience the world. Maternal confidence, tactile contact, gentle handling, and a stable environment aren’t “nice extras.”
They’re inputs into the puppy’s stress architecture. We’re watching the nervous system being calibrated in real time. Genetics sets the range, but early experience helps decide where inside that range the dog develops.
It doesn’t mean a single imperfect moment ruins a litter, and it doesn’t override genetics. But it does underline something breeders already suspect, early care matters in ways we’re only beginning to put language to. The whelping box isn’t just a nursery, It’s the first classroom for the nervous system.
What I like about this research is that it shifts the early care that I and others do as the norm from a “nice idea” into biology. If early experiences can tune a stress system in mice and we know mammals share the same core architecture then it raises an obvious question for dog breeders, what are we doing, intentionally or unintentionally, during that window?
That’s where conversations about early neurological stimulation come in.
ENS isn’t magic and it isn’t a shortcut around genetics, but it’s built on the same principle Meaney’s work highlights, that early inputs matter. The environment is part of development, not separate from it, And the whelping box is the first place that interaction happens.
