He’s standing in the kitchen doorway, and he’s waiting.

Not for food — he’s already eaten. He’s just standing there, facing the room, taking a second longer than he used to before deciding where to go.

By ten o’clock he’s fine. He’ll find you, lean on your leg, do what he’s always done. That’s what makes it hard to explain — by the time you’d think to mention it, it’s passed.

So you’ve started working around it. You leave the hall light on. You say his name before you touch him now, because twice he startled. You moved his bed out of the corner, because he got wedged in there one evening and couldn’t back out.

None of that is you being dramatic. That’s you adapting to something real, one small change at a time, without ever deciding it was a thing.

If you had to say it out loud, it would probably come out as: he’s just a little more confused lately. Which is a strange sentence to hear yourself say.

Here’s what almost nobody explains. When something changes in an older dog’s brain, the brain cells usually aren’t where it starts.

It starts one level below them — in the plumbing that feeds them.

• You leave a light on that you never used to
• You say his name before you touch him, because he’s startled once or twice
• You’ve moved furniture — a bed away from a corner, a chair out of a walkway
• You watch him more closely in the first hour of the day than all the rest
• You’ve stopped assuming he’ll follow you room to room
• You sleep lighter than you did, because some nights he’s up and pacing
• You already looked this up once, late at night, and closed the tab

If three or more landed, the pattern is worth understanding rather than worrying about in the dark.

Here’s the part that gets left out. In an aging brain, the first thing to change usually isn’t the neurons. It’s the network of tiny vessels that feeds them.

A working brain doesn’t run on one steady flow of blood. It redirects. When a region gets busy — recognising a face, working out how to get around a chair — the vessels feeding it widen on demand and deliver more. That coupling is one of the first things to loosen with age.

In studies on aging mice, that on-demand widening measurably weakened — and restoring NAD+, the helper molecule cells spend to make energy, improved it again [1]. Even the NAD+ decline behind it is less settled than it sounds: one review across species found the evidence for a universal drop thinner than usually told [2].

Now the honest part, because this doesn’t hold up without it: that work was done in mice, not in dogs. Nobody has shown what oral dosing does to NAD+ inside a dog’s brain. It’s the open question in this field, and anyone telling you otherwise is selling past the evidence.

What that leaves is a mechanism worth supporting, not a promise. A supplement is not a treatment. Talk to your vet.

And one thing worth saying plainly: not every change in an older dog is normal aging. Some are medical conditions that look similar and need a vet, not a supplement. If something changed fast, or came on over days rather than months, get him seen first.

Most owners reading this have already spent money here. A senior-formula kibble. A brain-support chew that promised sharper, brighter, more like himself. Maybe two brands across a couple of years, each bought with real hope on a morning that had gone badly.

Then nothing much changed, and you filed it as your own fault. You didn’t give it long enough. You bought the cheap one.

Almost none of that is true. There are two plainer explanations.

First: most of those products aim at the brain cell, not at the vessel feeding it. They aim at the bulb. If what changed is the wiring that answers when a room gets busy, the bulb isn’t where to work.

Second: a lot of what you pour on dinner never gets in. Stomach acid, first-pass loss in the liver, actives that barely dissolve. The label prints one number and the cell receives a much smaller one. A chew he spits out is a zero dose — but one he swallows can still land closer to zero than the label suggests.

Underneath both sits the same thing. Every cell, including the ones lining those vessels, runs on mitochondria — tiny power plants that turn food into usable energy. They get less efficient with age [3]. And they run on NAD+. In aging mice, an enzyme called CD38 climbs with age and spends it faster [4]. That part hasn’t been studied in dogs yet.

Less made. More spent. And the tissues that show it first are the ones doing the most on-demand work.

Pawprint Protocol was built by owners who had already tried the brain-support shelf and wanted to know what sat underneath it.

Working with veterinary advisors, they built a daily liquid around one job: give cells the building block they use to make NAD+, in a form that actually absorbs.

The lead active is NMN — the direct precursor cells use to make NAD+, and the only active in this formula with published research in dogs behind it. What that research shows is worth stating precisely: oral NMN has been studied in beagles for safety and tolerance, and it came through it [5]. The NAD+ measurements in that same paper were taken in mice, not in the dogs. Two arms, one study — and it would be easy, and wrong, to blend them into one sentence about dogs.

So here is the honest shape of it. NMN’s safety in dogs: studied. NMN raising NAD+ inside a dog’s brain: not shown by anyone yet. The vessel mechanism this page is about: shown in aging mice. If you were waiting for the chart of dogs getting sharper, that’s why there isn’t one.

What there is instead: a mechanism worth supporting, a safety record in dogs, and a delivery built so the actives arrive. Delivery is what decides whether any of it matters. Pawprint Protocol is a liposomal liquid, not a pill or a chew. Each active is wrapped in a tiny fat-based shell that shields it on the way through — built to be absorbed, not just swallowed.

And it’s a few drops on whatever he already eats. No pill pockets, no cheese, no chew he has to agree to. Individual results may vary.

The senior shelf is a wall of the same promise: sharper, brighter, more like himself. If it had worked for your dog, you wouldn’t have read this far.

Pawprint Protocol works one level below it — at the cellular energy those vessels depend on to keep answering. A few drops on his food, once a day.

Four actives, each with a job:

• NMN: The direct building block cells use to make NAD+, the helper molecule cells spend to make energy. This is the lead, and the one with published dog research behind it.
• NAD+: Part of the same pathway, supporting the cellular energy system every tissue runs on.
• Resveratrol: A plant compound studied alongside NAD+ in the cell’s energy and repair signalling.
• CoQ10: Sits inside the mitochondria, where energy actually gets made.

All four in a liposomal liquid, because an ingredient that doesn’t get absorbed is a line on a label, not a dose.

✔ Supports normal cognitive function in senior dogs
✔ Supports healthy blood flow in the aging brain
✔ Supports the cellular energy that naturally declines with age
✔ Works alongside any food (kibble, raw, fresh, home-cooked)

Made for dogs 7 and up. A supplement is not a treatment. Talk to your vet. Individual results may vary.

You don’t have to wait three months to see anything. Most owners tell us the first changes are small and show up in days to weeks — and they almost always show up in the first hour of the day, because that’s where this lives. Here’s the pattern owners describe most often. Individual results may vary.

Small, and easy to miss if you’re waiting for something dramatic. He comes into the kitchen and picks a direction instead of standing there deciding. One owner told us the thing they noticed first wasn’t him at all — it was that they’d stopped holding their breath through the first ten minutes of the morning. Individual results may vary.

This is usually where the small workarounds start going unused. He follows you room to room again without stopping at the threshold. The hall light stays off and nothing happens. Owners often say the mornings stop feeling like a test. Individual results may vary.

Owners often mention the furniture here — the bed back in its old spot, the chair where it always used to sit, and no wedging. He turns around in a tight space instead of waiting for help. Good mornings stop being events and start being most mornings.

For most families this is the one they actually notice: the light, the name before the touch, the moved furniture — all of it quietly retired, and they couldn’t say which week.

Three months in, the job changes from noticing to keeping. Age keeps working on the same system, so the dogs who hold their ground are the ones who stay on it.

And it’s worth saying plainly: the earlier a dog starts, the more there is to support. Individual results may vary.

The mornings aren’t the start of this. They’re the part you could finally see.

Everything before them — the extra beat in the doorway, the light you leave on, the corner you moved his bed away from — was the same quiet thing, showing up the only way it could. None of it says his brain has given up. It says the system feeding it is working harder for less.

That’s supportable. And it starts with a few drops on dinner tonight.

A supplement is not a treatment. Talk to your vet.

Reviews are unedited excerpts from verified Trustpilot reviews of Pawprint Lab. Individual results may vary.

[1] Tarantini, S. et al. Nicotinamide mononucleotide (NMN) supplementation rescues cerebromicrovascular endothelial function and neurovascular coupling responses and improves cognitive function in aged mice. Redox Biology, 2019;24:101192. Mouse study. PMID 31015147.

[2] Peluso, A. et al. Age-Dependent Decline of NAD+ — Universal Truth or Confounded Consensus? Nutrients, 2021. Review. PMID 35010977.

[3] Chistiakov, D.A. et al. Mitochondrial Aging and Age-Related Dysfunction of Mitochondria. BioMed Research International, 2014. Review. PMID 24818134.

[4] Camacho-Pereira, J. et al. CD38 Dictates Age-Related NAD Decline and Mitochondrial Dysfunction Through an SIRT3-Dependent Mechanism. Cell Metabolism, 2016. Mouse study. PMID 27304511.

[5] You, Y. et al. Subacute Toxicity Study of Nicotinamide Mononucleotide via Oral Administration. Frontiers in Pharmacology, 2020. Safety study in beagles; NAD+ was measured in mice, not dogs. PMID 33384603.