He died because I didn't know.

I was a little girl in Vietnam when my mother came home from the market with a dog.

He was black and white, spotted, and he had been destined for the meat trade. She brought him home instead. He became mine the way dogs become a child's — completely, without either of us ever deciding it.

I named him Mary.

He was a boy. I want to explain that, because it turns out to explain everything else. We had seen Mary Poppins. It was the only English word anyone in our house knew. I did not know Mary was a name for girls, and there was no one to tell me — not my mother, not a neighbour, not a book. So I gave the dog I loved the only English word I had, and for the whole of his life he was Mary, and he was a boy.

People laugh when I tell them, and they should. It is funny. But I have turned it over for a long time and I have stopped hearing it as a joke about how backward we were. We did not get his name wrong because we were stupid. We got it wrong because there was nothing and no one to ask.

That is the same emptiness that killed him. Nobody to tell a family what a word meant. Nobody to tell them what a dog needed. It is one gap, and it took two different things from us.

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This was before the internet, and almost everything we did for him we did by guessing.

We had no leash. My mother had stockings that had gone to ladders, and we tied those together into a lead. I have thought about that picture many times since — a boy dog named Mary, walking at the end of my mother's ruined stockings. It would be easy to call that backward. I have called it that myself. But we were not careless. We were improvising love out of the only materials in the house.

He ate what we ate. Leftovers, whatever was in the pot, spicy or not spicy. It did not occur to us that there was a difference that mattered to him, or that rich and heavily seasoned food does a particular kind of slow damage to a dog. Nobody had told us. It never crossed our minds that there was something to be told.

And his favourite — I can still see this — was the braised beef shank from a street cart near our house. He devoured it. Every scrap, every time, with his whole body. If you have ever watched a dog be completely and uncomplicatedly happy, you know exactly what I am describing, and you will understand why I still think about a street cart.

What we did not know was how much he needed to move. To walk, to run, to have somewhere to put his energy. There was nowhere to look it up.

So he had no outlet. A dog with no outlet does not stay calm. He grew restless, then anxious, then destructive. He chewed through the house. He began to bite — not out of meanness, but out of a frustration with nowhere else to go.

We did not understand that what we were watching was a symptom. We thought it was simply who he was.

Out of desperation, my family took him to a relative's factory yard. We told ourselves it was because there was space.

He was not given space. He was chained there — metal chains — because a restless, biting dog in a working yard could not be loose. I am writing it that way on purpose. For most of my life I said "he went to live at the factory," and that sentence was doing an enormous amount of work to protect me. A dog who had become difficult because he had nothing to do was given even less to do, and a chain. That is what we did. Not out of cruelty. Out of having run out of ideas.

And still — this is the part I cannot get past — Mary was overjoyed every single time I came. He would lose his mind with joy, the whole body, the way dogs do when they have been waiting. Chained in a factory yard, and still delighted to see the people who put him there.

One day a worker went to unclip the chain. Mary was too excited. He bolted through the gate before anyone could reach him.

A truck hit him. He died.

He ran because he had spent his life on a chain. That is the sentence I have never been able to put down.

He died because I didn't know.

Not because anyone was cruel. Not because we did not love him — we loved him very much. He died because the information that would have saved him was not available to a child and her mother in Vietnam before the internet. Somebody, somewhere, already knew exactly how much a dog like him needed to run. That knowledge existed. It simply never reached us.

That is the whole reason I do this work.

On the guilt

I have carried the guilt of all of it. The stockings, the spicy leftovers, the years of a dog with nothing to do. For a long time I thought the guilt was the point — that I owed him at least that much.

I do not think that any more. Guilt that stays inside you is a private tax on a dead dog. It does nothing for the next one. What guilt is actually good for is fuel, and mine became a mission: every hour I spend reading a study I cannot really spare is an hour aimed at somebody else's Mary.

And if you have found this page because something is wrong with your own dog, and you are lying awake turning over everything you did and did not do — I am not going to tell you it was not your fault. You would not believe me, and I would not have believed it either. What I will tell you is what I actually think, which is that not knowing is not the same as not caring, and that the only direction the feeling moves is forward. Find out what he needs now. That is available to you in a way it was never available to me, and it is the entire reason this site exists.

What I believe about information

Every owner who arrives here with a question is standing roughly where my mother and I stood. The details differ. The shape does not. Something is wrong with a dog they love, the answer exists somewhere, and there is a distance between those two facts that nobody has helped them cross.

The information that saves dogs already exists. It is written for specialists, priced for institutions, and buried in journals no ordinary owner will ever open. Dogs are lost to that distance far more often than they are lost to the disease itself. Closing a few feet of it is the entire job.

So I will not hide behind jargon. I will not write a sentence that is technically correct and practically useless. If a study is weak, I will say it is weak, and then I will still tell you what I think you should do — because "the evidence is mixed" is not an answer to a person whose dog is hurting tonight.

How I work

• Every factual claim carries a real, verifiable citation. If I cannot find a source, I say so plainly rather than dressing up a guess.
• On contested questions — raw food, e-collars, spay timing, breed risk — I argue both sides at full strength before I say where the evidence lands. You should finish the piece able to make your own decision, not mine.
• I distinguish strength of evidence. A randomized trial is not a case report. A study in mice is not a study in dogs. I will tell you which one you are reading.
• I am a researcher, not a veterinarian. I can tell you what the literature shows. I cannot examine your dog, and I will always send you to someone who can.

I do not have a dog of my own right now. On the questions I write about, I think the research voice is more useful when it is not quietly arguing from its own pet.

Read the guides at Dog Guides. If you have a question I haven't answered, send it to me — reader questions become future articles more often than anything else does.