Canine Digestion
No, Your Dog’s Gut Isn’t Leaky
Nobody can see inside. So learn to read the outside.
A healthy gut eats what is fed and metabolizes it properly. That is the whole definition. Everything past that is a story about why it is not happening, and most of those stories are being told by people who cannot see any more than you can.
The one thing to get right
Leaky gut names a mechanism. It does not tell you what to put in the bowl on Monday. Nobody looking at your dog from the outside can confirm it, including me, and even if we could, the word would not change a single thing we do next. What changes what we do next is reading the body.
The folder
She arrives with a folder. Bloodwork from two clinics that never spoke to each other. A food sensitivity panel. Three recipes from three different nutritionists. Notes from an animal communicator. A screenshot from a Facebook group with forty thousand members in it. Abdominal imaging.
Somewhere in the middle of all of it is the phrase leaky gut, and she says it the way people say a diagnosis.
I read every page. Not one of them told me whether her dog can eat what she puts down and use it.
That is the only question. Can this dog eat what is fed, and can the body turn it into something useful?
That is how a person ends up in analysis paralysis, and my hope is that you finish this article holding a different way of looking at your dog’s gut.
What the word is doing here
Intestinal permeability is real. The lining of the small intestine is one cell thick, and it is supposed to be selective about what crosses. There are conditions where it becomes less selective. That is not in dispute.
Here is the problem. In a living dog, standing in your kitchen, nobody can see it. The only way anyone genuinely looks at the lining of a dog’s small intestine is with a scope and a biopsy, and even then they are looking at a few millimeters of a very long tube.
So when a person tells you your dog has leaky gut, they are not reporting an observation. They are proposing a mechanism to explain something they watched from the outside.
And the mechanism does not come with instructions. It does not tell you whether to feed warm or cool, more or less, whether to add fat or pull it, whether this dog needs the meal made smaller or the meal made simpler. Two dogs can arrive with the same word attached to them and need opposite bowls.
This is why Chinese Medicine spends so much time on differentiation. Not because it is elegant. Because for two thousand years nobody could see inside either, and something had to fill the gap. What filled it was an extremely disciplined practice of reading the outside.
What actually walks through my door
Strip the vocabulary away and the same handful of dogs keep showing up.
Every one of those is a behavior you can see, at a time of day you can note, with a consistency you can track. That is data. It is better data than most of the folder.
The shag carpet
The inside of the small intestine is not smooth. It is lined with villi, millions of tiny upright fingers, and the whole point of them is surface area. Food moves along that surface and gets taken in. Picture a deep shag carpet.
In chronic inflammation, in long stretches of a diet the dog cannot handle, in some infections, those fingers flatten. This is villus blunting, and it is one of the things pathologists actually look for on a biopsy.
Now the carpet is flat. Food arrives, slides across it, and leaves.
That single picture explains the dog who eats plenty and does not gain. Nothing is wrong with the appetite. Nothing is wrong with the food, necessarily. The surface that was supposed to take it in is not there anymore.
Hold onto that, because it carries into the next part. A flattened surface is a structural problem. You do not fix a flat carpet by scattering seeds on it.
Which is why bacteria are not my first move
When a dog has gut trouble, the most common suggestion is more bacteria. A probiotic, a stronger probiotic, four probiotics, and then eventually somebody brings up a fecal transplant.
I am not against any of it. It is just the wrong end of the problem to start at. Bacteria need somewhere to land and something to eat. If the surface is flattened, or the middle is too cold to work, or the dog is being fed something it cannot break down, you can add organisms all day and they will not stay.
I wrote the long version of this argument separately, including what the veterinary research actually shows about FMT and how long the results last. Fecal transplants for dogs, and what the evidence shows.
The short version is that the terrain comes first. Which brings us back to reading it.
The differentials
Which kitchen is this?
In Chinese Medicine the middle of the body is a kitchen. Food comes in, gets cooked down, and the useful part gets sent up while the rest gets sent along. Nearly every gut complaint I see is one of seven things going wrong in that kitchen.
This is what I am doing while you are telling me about the folder. I am not deciding whether the gut is leaky. I am deciding which of these I am looking at, because that is the thing that changes the bowl.
Click the kitchen that sounds most like your dog.
The kitchen is understaffed. There is not enough hand power to get through the work.
You see Picky. Walks away from a full bowl. Eats better when hand fed. Sleepy after meals. Soft stool with food you can still identify in it. Will not gain however much you put down. Often a dog who was always a bit like this.
In the bowl Smaller meals more often. Everything cooked and warm, nothing straight from the fridge. Congee, well cooked rice or pearl barley. Gently cooked protein. This is not the dog for raw, and not the dog for a big rich meal once a day.
Herbal direction A tonic that strengthens the middle and puts hands back in the kitchen. When dampness has settled on top of the weakness, which it usually has by the time I meet the dog, the same tonic gets built out with herbs that dry and drain.
The kitchen is backed up. Nothing is moving through, and the counter is covered.
You see Sour smelling burps. A dog who is uncomfortable rather than sick. Restless in the night. Belly that is tight or tender. Eats grass right after a meal. Stool that smells strongly rotten. Often the dog gets worse the more you feed to fix it.
Think of a colicky baby. Nothing is diseased. The intake outran the capacity.
In the bowl Less, not more. Skip a meal. Pull the fat down. Simplify to one protein and one carbohydrate. Daikon or radish helps move things along.
Herbal direction A clearing formula. It does not strengthen anything. Its entire job is to break down what is sitting there and move it along, and this is one of the few situations where you see a change fast.
Some dogs live here almost permanently, because the meal that is being fed is chronically more than the kitchen can process. Clearing helps, but the portion and the recipe are the actual fix.
The kitchen is waterlogged. Everything is soggy and nothing dries out.
You see Soft, formed but heavy stool that leaves a smear. Greasy coat. Heavy and dull after eating. Worse in humid weather. Yeasty ears or paws. Thick coating on the tongue.
In the bowl Drying, not moistening. Pearl barley is the workhorse. Pull dairy, pull heavy fat, pull the very rich foods. Reduce total volume. Lean, plainly cooked protein.
Herbal direction A drying formula. Aromatic and bitter herbs that pull the water out of the middle so transformation can start again. Tonifying a waterlogged kitchen makes it wetter, so drying comes first.
The kitchen is pressurized. Things are moving, but not smoothly.
You see Gurgling you can hear across the room. Bloating. Discomfort that moves around rather than staying in one place. Visible relief after passing gas. Often worse when the household is stressed or the routine changed.
In the bowl Smaller meals, slower eating. Pull legumes and the cruciferous vegetables. A little warming aromatic helps, ginger or a small amount of cardamom. Do not overload the meal with fiber trying to fix it.
Herbal direction A tonic base with aromatic herbs added on top to move things through. The aromatics relieve the pressure. The tonic underneath is what keeps the pressure from building again.
The stove went out. There is not enough heat to cook anything down.
You see Recognizable food in the stool. Chronic loose stool that is not especially smelly. Seeks warm spots, sleeps curled tight. Cold ears and paws. Better with warm food, worse with anything cold. Very often a dog with several rounds of antibiotics behind them.
In the bowl Warm the food, always. Nothing straight out of the refrigerator, no ice, no frozen anything. Warming proteins like lamb or venison. Small amounts of ginger or cinnamon. Raw is the wrong direction for this dog even if it is the right direction for the dog next door.
Herbal direction A warming formula built on genuinely hot herbs, not a gentle tonic. The goal is heat in the middle, and the stool is usually the first thing to tell you it is working.
Damp and hot at once. Wet, and fermenting.
You see Urgency. Mucus or blood streaking. Stool that smells sharply foul rather than just unpleasant. Straining. Red around the anus. Often a red tongue with a yellow greasy coat. Worse in summer.
In the bowl Cooling and plain. White fish, rabbit, turkey. Mung bean. Pull lamb, pull rich fat, pull anything warming. This is the opposite bowl from the cold dog, which is exactly why the label on the folder does not help you.
Herbal direction A cooling formula that drains at the same time. Bitter cold herbs clear the heat while others pull the dampness out, because clearing one and leaving the other only solves half of it.
The walls are thin. The kitchen works until the weather changes.
You see Months of nothing wrong, then a predictable collapse. Every autumn. Every time the marine layer settles in. Every time the household travels. The dog is fine and then is not fine, on a schedule you could mark on a calendar.
In the bowl Stabilize before the season turns rather than after. Do not change the diet during the transition weeks. This is the one case where boring and unchanging is the entire strategy.
Herbal direction A guarding formula. Small, and given before the season turns rather than after things fall apart. It shores up the defensive layer so the change in weather does not reach the middle.
A dog can sit in two of these at once, and most chronic dogs do. Usually one is the original problem and the other is what grew on top of it. The order you address them in decides whether it works.
Why I start with a home cooked bowl
For most dogs with gut trouble, I want a home cooked diet, and the reason is not philosophical. It is that I need to control the variables.
Warm or cool, more fat or less, one protein or several, moist or dry, how much volume per meal, how many meals. Every one of those is a lever, and every one of those is decided for you by somebody else the moment you feed something out of a bag.
Once you are cooking, we can change one thing and watch what happens. That is the whole method. One variable at a time, long enough to see the answer.
Go read the outside
You cannot see your dog’s intestinal lining. Neither can I. Neither can the person who told you it was leaky.
What you can see is when the vomiting happens and what is in it. Whether the grass eating comes before or after the meal. Whether your dog runs warm or seeks the tile. Whether the stool holds its shape. Whether things fall apart in October every single year.
Write it down for two weeks. Not a diagnosis, just the observations, with times. That page will be worth more than the folder.
Work with me
Bring me the dog, not the label
If you have been cycling through products without knowing which one is doing anything, a consult is where we stop and read the dog. We work out which kitchen this is, then build the bowl for it and change one thing at a time.
Everything on this page is for educational purposes. I am a canine nutrition consultant with TCM Dietetics training and a doctoral student in acupuncture and Chinese Medicine. I am not a veterinarian. All clinical decisions rest with your veterinary team. Chronic vomiting, blood in the stool, and unexplained weight loss need a veterinary workup, and nothing here replaces one.