08/08/2026
🎲 Genetics is a dice roll — but you can only roll what is on the dice.
🐾 When people talk about genetics, it can sound as though anything is possible. It isn’t.
A puppy doesn’t arrive as a completely blank genetic lottery ticket. Mum and Dad — and the genetics carried through their lines — determine the options available.
Then the dice are rolled.
That is why puppies from the same litter can be noticeably different from each other. They share a genetic pool, but they don’t necessarily receive the same combination.
🐾 I simplify temperament into three principles:
👉 Threshold — how easily?
How easily does something produce a response? One puppy may notice something and barely change. Another may respond to a much smaller amount of the same thing.
👉 Drives — how strongly?
Once something matters to the dog, how strongly does the dog want to pursue it, obtain it, interact with it or act on it?
Food. Chase. Possession. Social interaction. Hunting. Avoidance. Different dogs can have very different amounts of motivation behind what they do.
👉 Nerves — how quickly?
How does the dog handle the pressure of what is happening around them, and how readily can they continue functioning through it?
⚗️ These three ingredients are part of the temperament foundation I describe when I speak with clients who need help with training and rescues who need help with assessments.
Now imagine that each parent contributes different possible versions of those ingredients. The genetic dice roll might produce one puppy with:
🐾 higher drive + lower threshold + stronger nerves
while a littermate might inherit:
🐾 lower drive + higher threshold + different nerves.
Neither puppy has stepped outside the genetics available to that breeding.
They have simply rolled a different combination. And this is where development matters.
👉 “Genetics is a dice roll, but you can only roll the options written on the dice. The parents give you the ingredients. The roll gives you the puppy. Development gives those ingredients form.” — Ariza
Explaining genetics through a family tree of gummy bears.