What your dog and cat's kibble is not telling you

Most parents assume kibble is “complete and balanced,” so it must be enough. On paper, it usually is.

In real life, the way the nutrients behave inside the dog or cat's body is very different. The difference comes from moisture, heat processing, ingredient quality, and how well nutrients survive digestion. This gap between what’s printed on the label and what the dog actually absorbs is where most issues begin: dull coats, inconsistent stools, dehydration, poor appetite, and the slow development of chronic low-grade inflammation.

These issues are not glaring or obvious. These are symptoms that are usually passed off as being 'pet' things. Fur on your furniture, stinky poop, wet dog smell. But this is NOT how healthy dogs and cats are supposed to be. Really.

Kibble is made by turning a paste of starch, powdered protein, fats, and premixes into small, shelf-stable pellets. It requires extreme dehydration and high-temperature extrusion. Even with good intentions, this process changes the food in predictable ways.

Moisture matters.

A dog’s natural diet carries 65–80% water. Their digestive enzymes, gut motility, renal filtration, and thermoregulation are all built for high-moisture meals. Kibble averages 7–10%. This pushes the dog’s body to compensate by drinking far more than usual. Many dogs and cats do not, which leaves the gut slightly drier than ideal. Over time, this slows digestion, alters stool texture, and increases the workload on the kidneys. No single bowl causes disease, but years of chronically low moisture do influence overall physiology. The difference becomes clearer in older pets or pets with early kidney or liver changes.

Heat changes nutrients.

Extrusion temperatures routinely cross 120–200°C. Proteins denature beyond what is biologically expected in natural food, fats oxidise, amino acids degrade, and vitamins often break down. This is not inherently bad but for our general understanding right now, it's not great. I will get into the nuances in the next posts. Manufacturers add vitamin-mineral premixes to compensate, which balances the numbers on paper but does not restore the food’s original biological behaviour. This is why the nutritional panel can look perfect while the dog still shows symptoms that improve with fresh food.

Bioavailability is not the same as “complete and balanced.”

A nutrient counted in a lab analysis is not the same as a nutrient absorbed in the intestine. Bioavailability refers to how much of that nutrient actually enters circulation and becomes usable. Kibble relies heavily on synthetic supplements because most natural vitamins are lost during processing. Synthetic nutrients can still be useful, but their absorption patterns differ. Some require cofactors that may no longer exist after heavy processing. Others interact with each other in ways that reduce uptake.

This is why a dog or cat on kibble may technically be meeting NRC recommendations yet still look dull, itchy, tired, or thin. The diet is meeting theoretical targets, not biological ones.

Starch load and gut behaviour.

Kibble needs starch to hold its shape. Even “grain-free” recipes rely on potatoes, peas, chickpeas, or lentils. Dogs can digest starch, but the quantity in kibble is higher than most dogs physiologically expect. Cats can barely do even that. High starch, low moisture, and repeated heat exposure can change how the gut ferments food. For some dogs and cats, this shows up as gas, inconsistent stools, or fluctuating appetite. For others, it shows up as low-grade inflammation that parents don’t notice until they switch to fresh meals and the dog/cat suddenly looks more energetic.

Fresh food behaves differently.

Gently cooked diets match the dog’s moisture requirements more closely. The proteins remain structurally intact, fats are less oxidised, minerals stay bound in natural forms, and digestive enzymes do not have to work as hard. Dogs and Cats often show better stool quality, better hydration, stable energy, and improved coat health simply because the food is easier for the body to use.

A practical way to look at it:

Imagine trying to meet your daily nutrition needs through dehydrated instant meals every day for years. The label may say “complete and balanced,” but your digestion, hydration, and nutrient absorption will behave differently from when you eat fresh food. Our pets experience the same mismatch.

What this means for most dogs and cats:

You don’t need to fear kibble. You need to understand its limitations. If you rely on kibble, adding moisture and some whole fresh components helps the gut do its job. If you switch to a fully fresh diet, the dog gets nutrients in the form closest to what their physiology expects. The difference is not something that is dramatic or happens overnight. But it is definitely there - you will see slow, steady improvement and most pet parents notice this in the first few weeks.

The bottom line:

Fresh food is not a trend. It's a little absurd how we are so 'okay' with feeding our pets out of a pack. That we questions fresh ingredients so much! That we have somehow accepted that this is the best for them when it most definitely is not.

Fresh food is what behaves biologically in a way the dog or cat can use more efficiently. Moisture, bioavailability, and ingredient structure are crucial and that is why, dogs and cats

often look and feel better on real food compared to kibble*.

Have questions? Comment below. * Not all kibble is bad. Not all fresh food is better. I'm making generalisations here and expect a certain level of critical thinking and open mindedness from readers :)