In partnership with
Hi friends,
You know what a grill looks like.
You know what a frying pan looks like.
You’ve probably used an air fryer.
But here's a machine you've almost certainly never seen in person… even though it cooks the vast majority of dry dog food on the market.
It's called an extruder.
And it's nothing like the cooking tools in your kitchen.
So what is an extruder?
Imagine if a pressure cooker, a giant metal corkscrew, and a Play-Doh Fun Factory had a baby.
That baby would be an extruder.
It's a machine that forces a dough-like mixture through a shaped opening under high pressure and high heat. The food cooks inside the machine, not on a stove or in an oven.
Here's what that machine looks like:
A barrel … a long metal tube where it all happens
A screw … a giant spiral inside the barrel that pushes the food forward
A die … a metal plate at the end with tiny holes
A knife … a spinning blade that cuts the kibble as it exits
That's the extruder. Simple parts. Intense process.
How does it cook the food?
Most cooking methods use heat from an outside source. A flame under a pan. Hot air in an oven. Boiling water in a pot.
Extrusion is different.
The food cooks from a combination of mechanical shear, compression, steam, and added heat. As the screw spins, it pushes the dough forward under pressure while the mixture is heated inside the barrel.
Temperatures often reach around 150°C / 300°F.
So the food doesn't simmer. It doesn't bake.
It gets compressed, heated, and worked over all at once inside a metal tube.
What happens to the food in there?
By the time the dough reaches the end of the barrel, it's no longer just dough. It's a dense, super-heated mass under pressure.
Then it's forced through tiny holes in the die.
The moment it pops out into normal air, the pressure drops. Trapped moisture flashes into steam. The food expands… like a puffed cereal. A spinning knife cuts it into little pieces.
That's kibble.
Then it's dried. Then it's sprayed with fats and added nutrients. Then it's bagged.
Why don't we have extruders in our kitchens?
Because extrusion is an industrial cooking method.
It's designed for one thing… continuous, high-volume production of shelf-stable food.
Dry kibble is typically brought down to about 10 to 12% moisture, which is a big reason it can sit in a bag for months without spoiling.
Grills, pans, and ovens are for cooking meals.
Extruders are for manufacturing products.
That's not a judgment. It's just a fact.
And it's worth knowing, because that extruder is cooking the food your dog eats every single day.
Smart starts here.
You don't have to read everything — just the right thing. 1440's daily newsletter distills the day's biggest stories from 100+ sources into one quick, 5-minute read. It's the fastest way to stay sharp, sound informed, and actually understand what's happening in the world. Join 4.5 million readers who start their day the smart way.
Next time…
Next time… the cost of convenience.
Because once you understand how kibble is made… the next question is what that process does to the food itself.
Sláinte
Linda & Blue 🐾
Want to make sure you don't miss the next chapter in our kibble investigation? Subscribe to Dog Blueprints for free and get the truth delivered straight to your inbox.