He had a great time. That’s the part you keep coming back to.

Twenty minutes at the park, the good kind — the trot that turns into a run, the ridiculous spin before he drops the ball at your feet. You drive home and he sleeps in the back like he earned it.

Then Sunday. He’s slow off his bed. The first ten minutes are careful. By the afternoon he’s mostly himself, and by Monday you’d never know.

So you did the sensible thing. You made the park shorter. Then every other day. You put the fun on a day you could afford to lose.

And somewhere in there it stopped being a decision and quietly became the schedule.

Here’s the part almost nobody says out loud: you’ve started rationing his good days to protect the day after.

That isn’t him slowing down. That’s you managing a bill that keeps arriving.

And here’s what owners notice and can’t quite place. The twenty minutes are still good. He still wants to go. The wanting hasn’t changed — it’s the recovering that got expensive.

If age were wearing him down evenly, the wanting would go first. It’s the last thing to go. What changed is how long his body takes to close the file on a hard afternoon.

• You’ve made the park shorter — twenty minutes instead of forty, because you know what tomorrow costs
• You put the big walk on Saturday, because Sunday is already written off
• You wait out the careful first ten minutes off his bed instead of hurrying him
• You’ve started saying no to the second lap, and he hasn’t
• You check on him more the day after than the day of
• You already tried a joint chew or a fish-oil pump, and the day after arrived anyway
• His appetite and interest are unchanged — it’s only the bounce-back that got slower

If three or more of those landed, read this next part slowly.

Inflammation isn’t the villain. It’s the repair crew. He runs, something gets slightly strained, the body raises a flag and sends help. The flag is supposed to go up, then come back down.

What changes with age isn’t the flag going up. It’s the flag not coming all the way back down [1]. A review of immune aging in dogs and cats reports the pattern seen across mammals — protective capacity drops, background inflammation creeps up — and notes far less of it has been measured in dogs than in rodents or people.

So the switch sits slightly on, all the time, with nothing to fight. And holding it on costs power. In mice and in cells, inflammatory cells that gather in aging tissue carry an enzyme called CD38, which spends NAD+ — the helper molecule the cell’s energy runs on [2]. That hasn’t been done in dogs.

A smoke alarm with a flat battery doesn’t stop ringing. The alarm that won’t switch off runs the battery down — and a flat battery is slow at everything. That’s why recovery goes long before appetite does.

One more thing, and it matters more than the mechanism. Not every slow recovery is aging. Some are medical conditions that look almost identical and need a vet, not a supplement. If it came on suddenly, or one side is clearly worse, get him seen first.

Most owners reading this have already spent money on exactly this problem. A bag of chews. A fish-oil pump. A green-lipped mussel powder somebody swore by. Each one bought on a Saturday with real hope, and judged on a Sunday.

And when Sunday came anyway, most owners quietly filed it under their own fault. Didn’t give it long enough. Bought the cheap one. Should have researched harder.

Almost none of that is true, and neither explanation is your judgement.

First: most of that shelf is built for the joint, and Sunday isn’t only a joint problem. Cushioning cartilage does nothing about how long the repair flag stays up, or what it costs to keep flying.

Second: the thing running low is the power supply, and almost nothing on that shelf is aimed at it.

Here’s the layer underneath. Muscle, brain and heart cells are packed with mitochondria — tiny power plants that turn food into usable energy [3]. They run on a helper molecule called NAD+, which in people is widely reported to fall with age, though researchers still argue about how universal that is [4]. In studies on aging mice, an enzyme called CD38 climbs with age and drains that supply faster [5]. That part hasn’t been studied in dogs yet.

Less made, more spent. And the first place a low battery shows is the job that takes the longest — putting things back the way they were. Individual results may vary.

Pawprint Protocol was built by owners who had already been through the joint 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+, and deliver it in a form that survives the trip.

The lead active is NMN — the direct building block for NAD+, and the only active in this bottle with published dog research behind it. Oral NMN has been through a subacute toxicity study that dosed beagles and found it well tolerated [6]. Be clear what that is: a safety study. The NAD+ readings in that paper came from mice, not the beagles.

So it says the ingredient is reasonable to give a dog. It doesn’t say it fixed anybody’s Sunday. That’s the honest version, and it’s the one worth having.

Then delivery. Pawprint Protocol is a liposomal liquid, not a pill and not 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 onto whatever he already eats. No pill pockets, no cheese. What owners notice first isn’t the park — it’s the Sunday. Individual results may vary.

The senior shelf is a wall of one promise: cushion the joint, take the stiffness out. If that had worked for your dog, you wouldn’t be reading this on a Sunday.

Pawprint Protocol works a level below the joint — at the cellular energy every repair job gets paid for out of. 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 the energy system runs on. The lead, and the only one here with published dog research behind it.
• NAD+: Part of the same pathway, supporting the cellular energy system recovery gets paid for out of.
• Resveratrol: A plant compound in the formula, studied alongside NAD+ in the cell’s energy and repair signalling.
• CoQ10: Sits inside the mitochondria — the power plants in the cell — where energy gets made.

One thing we won’t do, and here’s why. Resveratrol gets sold as an immune ingredient. In a lab study on blood drawn from healthy dogs it went the other way — the burst response got weaker, the inflammatory signal went up, and the effect grew with the dose [7]. Cells in a dish aren’t a dog on a rug, and no dog in that study was given resveratrol by mouth. But it’s canine data pointing the wrong way, and we won’t pretend otherwise. Nothing here rides on resveratrol.

Everything we claim rides on NMN and cellular energy.

✔ Supports a normal, healthy inflammatory response
✔ Supports the cellular energy that naturally declines with age
✔ Liposomal liquid — built to be absorbed, not just swallowed
✔ Works alongside any food (kibble, raw, fresh, home-cooked)

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 change shows up in days to weeks — and it almost always shows up as a day that didn’t go the way they’d braced for. Here’s the pattern owners describe most often. Individual results may vary.

Small, and easy to miss if you’re watching the park instead of the day after. The careful first ten minutes off his bed becomes four. He’s up on the first try instead of the second. One owner told us what she noticed was that she’d stopped standing in the doorway watching him get up.

This is usually where Sunday stops being the price of Saturday. The second lap comes back. Owners describe going a little further without deciding to, because he didn’t turn for home at the usual corner.

Owners often mention the calendar here. The written-off day stops needing to be written off. The long stretch by the water bowl gets rarer, then stops being a thing you watch for. Good days stop being events and start being most days.

For most families this is the one they actually notice: they haven’t built a week around a recovery day in a month, and they can’t say when that stopped.

Three months in, the job changes from noticing to keeping. Aging doesn’t pause, and the switch doesn’t stay down because you stopped paying attention — 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.

Sunday wasn’t the start of this. It was the part you could finally see.

Everything before it — the shorter park, the second lap you stopped offering, the day you learned to leave empty — was the same thing showing up quietly. His body didn’t stop repairing. It started paying more for it, out of an account already running low.

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] McKenzie, B.A. Immunosenescence and Inflammaging in Dogs and Cats. J Vet Intern Med, 2025. Review. PMID 40448658.

[2] Covarrubias, A.J. et al. Senescent Cells Promote Tissue NAD+ Decline via CD38+ Macrophages. Nat Metab, 2020. Mouse study, in mice and in vitro; erratum 2021. PMID 33199924.

[3] Chistiakov, D.A. et al. Mitochondrial Aging and Age-Related Dysfunction of Mitochondria. Biomed Res Int, 2014. Review. PMID 24818134.

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

[5] Camacho-Pereira, J. et al. CD38 Dictates Age-Related NAD Decline and Mitochondrial Dysfunction. Cell Metab, 2016. Mouse study. PMID 27304511.

[6] You, J. et al. Subacute Toxicity Study of Nicotinamide Mononucleotide via Oral Administration. Front Pharmacol, 2020. Safety study in beagles; NAD+ measured in mice, not dogs. PMID 33384603.

[7] Woode, R.A. et al. Resveratrol Decreases Oxidative Burst Capacity and Alters Stimulated Leukocyte Cytokine Production In Vitro. Vet Immunol Immunopathol, 2015. Non-clinical; canine cells in vitro, not oral dosing. PMID 25579176.