He had a good day yesterday.

The long walk, or the beach, or the grandkids came over. He was himself the whole way through it — the dog you remember, not the dog you’ve been quietly adjusting to.

And today he’s flat.

Not limping. Not sick. Nothing you’d phone anyone about. He just sleeps later, and heavier, and when you come into the room he lifts his head instead of getting up. By tomorrow he’ll be back.

You’ve already explained it to yourself, probably more than once. He earned it. He’s getting older. Big day, big sleep.

Here’s the part that explanation doesn’t cover.

The big day didn’t change. The recovery did.

Two years ago that same walk cost him nothing. He’d have done it again the next morning and asked for more. The walk isn’t harder now. What’s changed is how long it takes him to clear it.

That gap — between what he spends and how long he takes to get it back — is one of the earliest things to move in an aging dog. It’s also the easiest to miss, because it doesn’t look like a problem. It looks like a dog having a lie-in.

It isn’t his legs, and it isn’t his heart.

It’s a cleaning job falling behind.

• You’ve started thinking of the day after a big day as his recovery day
• You schedule the long walk for a Saturday so he has Sunday to sleep it off
• He sleeps deeper after a big day than he used to, and later into the morning
• You’ve turned a walk short that you wouldn’t have shortened two years ago
• His coat doesn’t hold the shine it used to, and you’ve put that down to age
• Nothing is actually wrong with him — which is why you’ve never mentioned any of this
• You’ve read the back of a senior supplement with no idea which words mattered

If three or more of those landed, here’s what’s going on underneath — and it isn’t damage.

Every cell in his body makes energy by burning fuel. And like anything that burns, it leaves waste behind. That waste is constant and completely normal. It isn’t a malfunction, it’s the exhaust from being alive.

A healthy body has a clean-up crew for it. Not one cleaner — a whole set of the dog’s own enzymes, each handling a different part of the mess.

Two things shift as a dog ages. The mitochondria, the parts of the cell that make the energy, get less efficient — so the same work leaves more waste behind than it used to [1]. And the crew that clears it gets slower to turn up.

That’s the gap. More mess, slower housekeeping. It doesn’t look like illness because it isn’t illness. It looks like a dog who needs an extra day.

And here’s what makes this something you can work with rather than just watch. The crew isn’t gone. Every one of those enzymes is still written into his cells. What fades is the signal that calls them out.

That signal has a name. It’s called Nrf2, and it sits clipped in place inside the cell doing nothing until something releases it. When it is released it doesn’t clean anything itself — it switches on a whole battery of the body’s own protective enzymes at once [2].

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 on one side only, get him seen first.

Most owners reading this have already spent money here. A bag of antioxidant chews. Something with blueberries on the front. A senior formula with a long list on the back.

And nothing you could point to changed, and somewhere along the way you decided that was your fault. You picked the wrong one. You didn’t give it long enough.

Almost none of that is true, and there are two simpler explanations.

First: most antioxidant products try to do the cleaning themselves. An antioxidant molecule you swallow can neutralise one piece of waste, and then it’s spent. You are bailing with a teaspoon. His own enzymes don’t work that way at all — each one works catalytically, handling piece after piece without being used up. The crew he already owns is in a different league to anything you can pour on his dinner.

Second: the crew still needs power. Those enzymes sit inside the mitochondria, and the switch that keeps the main one sharp belongs to a family that only works when NAD+ is available — the helper molecule cells use to turn food into usable energy. In mice, that switch, SIRT3, is what keeps the mitochondria’s main clean-up enzyme in its active state [3]. That part hasn’t been studied in dogs.

And it’s worth being straight about how settled that picture is. One review across species notes the evidence for a universal age-related NAD+ decline is thinner than it is often made to sound [4]. The mechanism is well described. The bookkeeping isn’t finished.

Pawprint Protocol was built by owners who had already worked through the antioxidant shelf and wanted to know what sat underneath it.

Working with veterinary advisors, they built a daily liquid around one idea: instead of adding cleaners from outside, support the system that calls the dog’s own crew in — and keep it supplied with energy.

The lead active is NMN, the direct building block cells use to make NAD+. It’s the hero for a simple reason: it is the only active in this formula with published dog research behind it. Oral NMN has been given to beagles in a published study and looked at for safety and tolerability [5]. That study asked whether it is safe to give — it did not measure whether it changed anything in a dog. Worth knowing exactly what it does and doesn’t show.

Alongside it, resveratrol is the part that does the calling. It isn’t the cleaner. It’s the phone call — the compound studied for releasing Nrf2 so the dog’s own enzyme battery gets switched on. It sits at a supporting level, and the antioxidant story here rides on what his body makes, not on what the dropper adds.

The closest thing to a canine read: a small study gave healthy adult dogs an oral B3 compound daily and measured their blood before and after. Total antioxidant capacity moved up over the study and the marker for oxidative damage moved down [6]. Be careful with that one — seven dogs, no control group, and a different compound from what’s in this bottle. A direction, not a proof. And to be completely straight with you: no published study has tested Pawprint Protocol itself. Everything above is evidence about the ingredients and the pathway, not about this bottle.

Then the delivery. Pawprint Protocol is a liposomal liquid — each active wrapped in a tiny fat-based shell so it arrives intact instead of breaking down on the way. 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.

The senior shelf is a wall of the same idea: pour in more antioxidants, mop up more waste. If that idea had worked for your dog, you wouldn’t still be reading.

Pawprint Protocol works a level below it — on the cellular energy the dog’s own clean-up crew runs on. A few drops of liquid 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 that powers the switches inside the mitochondria. This is the hero, and the one with published dog research behind it.
• NAD+: Included as part of the same pathway, supporting the cellular energy system the housekeeping enzymes depend on.
• Resveratrol: Studied for its role in releasing Nrf2 — the switch that turns on the body’s own antioxidant enzymes.
• CoQ10: Sits inside the mitochondria, where the 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 the body’s own normal antioxidant defences
✔ Supports the cellular energy that naturally declines with age
✔ Built to be absorbed, not just swallowed
✔ Works alongside any food

Made for dogs 7 and up. Individual results may vary.

You don’t have to wait three months to see anything. Most owners tell us the first changes show up in days to weeks — and on this angle they almost always show up as a day that didn’t need to be written off. Here’s the pattern owners describe most often. Individual results may vary.

Small, and easy to miss if you’re watching for something dramatic. He’s up at his normal time the day after a long one instead of sleeping through it. The lie-in shortens by an hour, then two. One owner told us the thing she noticed first was that she’d stopped tiptoeing past his bed in the morning.

This is usually where the day after stops looking different from any other day. Owners describe planning less around it — the long walk moves off Saturday because it doesn’t need a Sunday behind it any more. He’s ready again before you are.

Owners often mention the walks stretching here — not because they pushed him further, but because he didn’t turn for home. The big days come more often, and they cost less. Good days stop being events and start being most days.

For most families this is the one they actually notice: there hasn’t been a recovery day in weeks, and they can’t say exactly when that stopped.

Three months in, the job changes from noticing to keeping. Oxidative load doesn’t pause and the housekeeping side of aging keeps going, 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 of that crew there is to support. Individual results may vary.

The slow recovery isn’t the start of this. It’s the part you could finally see.

Everything before it — the deeper sleep, the later mornings, the walk you quietly turned short — was the same thing showing up without a name. Nothing broke. The housekeeping just fell behind the mess.

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

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

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

[2] Taguchi, K. et al. Molecular Mechanisms of the Keap1–Nrf2 Pathway in Stress Response and Cancer Evolution. Genes Cells, 2011. PMID 21251164. Review.

[3] Qiu, X. et al. Calorie Restriction Reduces Oxidative Stress by SIRT3-Mediated SOD2 Activation. Cell Metabolism, 2010. PMID 21109198. Mouse study.

[4] Peluso, A. et al. Age-Dependent Decline of NAD+ — Universal Truth or Confounded Consensus? Nutrients, 2021. PMID 35010977. Review; concludes the evidence for a universal decline is limited.

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

[6] Derakhshandeh, N. et al. Oral Nicotinic Acid Administration Effect on Lipids, Thyroid Hormones, and Oxidative Stress in Intact Adult Dogs. BMC Veterinary Research, 2025. PMID 40038732. Uncontrolled non-clinical study in 7 healthy dogs; a different product from Pawprint Protocol.