Steady Heart · Zack D script v3

Why this format transfers

The arcade video is not a funny 3D video. It is a causal chain through hidden internals ending in a measured number, then a substitution: the T-Rex claw gap replaces the slit in the blade. Steady has the identical shape. The liver step is the bottleneck, it fades with age, and the scoop substitutes for it. The product does in the ad exactly what it does in the body.

The three diamonds pain · limiting belief · belief gained

#	Pain	Limiting belief broken	New fact
1	The heart needs a thing his body is making less of	"It's in his food"	Dogs don't eat taurine. They build it.
2	Same bowl, less coming out, and it's silent	"Not my dog"	Big dogs make less. Some breeds are born slower. Grain free makes it worse.
3	You can't give him his young body back	"So I'll grab a heart chew"	Vets dose in grams. A chew carries a sprinkle. Capsules take four to eight a day.

Diamond 2 is the self identification beat. The viewer sorts himself into the affected group, which is what drives the click. Diamond 3 closes on arithmetic rather than a claim, which is why it survives Meta review.

Diamond 1 · What it is

0:00 to 0:11

The machine gap opens at 0:00, pays at 0:05

t	VO	Start frame
0:00	There's one thing your dog's heart cannot work without.	Golden retriever PUPPY eating from a speckled ceramic bowl, warm kitchen, macro on kibble
0:03	His body used to make plenty of it.	The heart close. Brass dial set into the chest wall, needle high. Diegetic prop, never overlay
0:05	Dogs don't eat taurine.	The bowl again, red X wiping across it
0:06	They build it.	INSIDE THE LIVER: brass production line running hot, gold taurine pellets off the belt. Hero image
0:08	Protein goes in. The liver converts it.	Two labelled molecules riding the belt into the machine
0:10	The heart runs on what comes out.	Gold pellets travelling the arrow path to the heart

Diamond 2 · Who and why

0:11 to 0:24

The decline four sorting criteria, all sourced

t	VO	Start frame
0:11	At one, that line runs hot.	Brass counter reading YEAR 1, belt at full speed, sparks
0:13	By six, it's slowing.	Counter spinning forward 2, 3, 4, 5. Belt dimmer, lamps going out one by one
0:15	Same bowl. Same food.	Identical speckled bowl, identical kibble. SHOT MATCHED to 0:00
0:17	Less coming out.	Brass dial, needle now low. SHOT MATCHED to 0:03
0:18	Big dogs make less than small ones.	Split frame, small dog's line fast, large dog's crawling
0:20	Some breeds are born slower.	Line up silhouette, several breeds, dials at different levels
0:22	And grain free diets make it worse.	Legume heavy kibble close, dial ticking down

Diamond 3 · The misdirection, then the dose

0:24 to 0:45

The substitution person shifts to third at 0:24

0:24	So to fix it,	Six year old dog beside the machine, green question mark above him
0:25	you'd need the factory he had at one.	Brass counter, hand hovering
0:27	You'd need him. Six years ago.	Counter SPINNING BACKWARD 5, 4, 3, 2, 1, light spilling out
0:29	[beat]	THE PUPPY FROM SHOT ONE steps out. Same markings, same collar. Both dogs in frame
0:30	So plug the puppy in. Let him run the line.	Absurd hero shot: puppy harnessed to the old dog's line, brass cabling, gold pouring. Machinery only
0:33	Or.	HARD CUT. Silence. Just the jar on the counter. Hold a full beat
0:34	Skip the factory.	Scoop over dinner. Cutaway: gold BYPASSES the liver, arrow straight to the heart
0:35	But vets dose taurine in grams.	Brass scale, gram weights stacking
0:37	A chew can't carry that.	Heart chew cross sectioned, one tiny speck of gold inside it
0:39	Capsules take four to eight a day.	Capsules piling up beside a single scoop
0:41	One level scoop. Already made.	Label macro, 1,000mg per level scoop. Dial climbing behind it
0:43	On dinner. Every dinner.	Scoop disappearing into the bowl
0:44	Turns out the puppy was useful after all.	Both dogs side by side, puppy looking pleased with itself

The full read

There's one thing your dog's heart cannot work without./His body used to make plenty of it./Dogs don't eat taurine./They build it./Protein goes in. The liver converts it./The heart runs on what comes out./At one, that line runs hot./By six, it's slowing./Same bowl. Same food./Less coming out./Big dogs make less than small ones./Some breeds are born slower./And grain free diets make it worse./So to fix it, you'd need the factory he had at one./You'd need him. Six years ago./So plug the puppy in. Let him run the line./Or./Skip the factory./But vets dose taurine in grams./A chew can't carry that./Capsules take four to eight a day./One level scoop. Already made./On dinner. Every dinner./Turns out the puppy was useful after all.

Dosing discrepancy · needs Jack

The dose physics argument is the ad's strongest weapon and it points somewhere awkward. Published vet guidance (Stern lab, UC Davis) is 500 to 1,000mg twice daily under 25kg, and 1 to 2g twice daily over 25kg. The PDP instructs one 1,000mg scoop once daily, which sits at or below the bottom of that range, and well below it for a large dog.

So the ad invites arithmetic our own label does not survive. Three ways out:

Move the label and PDP to twice daily. Also doubles consumption rate and helps the subscription maths.
Keep once daily and soften the VO to something like "vets work in grams, not sprinkles" so we never invite the comparison.
Resize the scoop.

Craft notes for the chief pass

"Or." at 0:33 is the most important word in the script. It is the deflate. It converts the gag into relief and makes the scoop feel like mercy instead of a pitch. Hold a full beat of silence on it.
Shot match 0:15 to 0:00, and 0:17 to 0:03. The identical bowl and the identical dial framing ARE the argument. If those two pairs do not match exactly, Diamond 2 collapses.
Same dog across ages. The 0:00 puppy and the 0:24 six year old must read as unmistakably one animal: same breed, same markings, same collar. Otherwise the time travel gag collapses into "a puppy turned up." Lock one character reference and drive every shot from it.
The dial is a physical brass prop, never a floating HUD number. Zack D readouts are always diegetic.
Person shifts at 0:24, "your dog" becomes "he" the moment the misdirection starts. That shift is itself a genre marker of the turn.
Steady is never named. The jar just arrives as the only thing that survives the arithmetic.

Sourcing

Every mechanism claim traces to an opened source, not a search summary.

Claim	Source
Synthesis declines with age	Frontiers in Veterinary Science 2026: "the activity of key taurine biosynthetic enzymes is relatively high during early life but progressively declines with aging, substantially reducing synthesis capacity in older dogs"
Big dogs make less	Same paper: "Large-breed dogs exhibit markedly lower rates of taurine synthesis compared with small-breed dogs"
Some breeds are born slower	Same paper: "certain dog breeds exhibit lower hepatic activities of taurine biosynthetic enzymes"
Grain free makes it worse	FDA investigation 2018, plus Kaplan et al PLOS One 2018. Both already linked on the live PDP
Gram level dosing	Stern lab UC Davis recommendations, dvm360 nutritional management proceedings

Compliance: structure and function only. No disease claim, no prevent, treat or reverse, no DCM mention. Nobody says the dog is sick, the needle simply falls. High stakes come from silence and time, never from illness. Zero em or en dashes.