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Longevity · Genetics & constitution

The baseline you were dealt, and why it’s not your fault.

Genetics is your dog’s inherited rate of aging: breed, body size, and build, read against life tables built from millions of dogs. It’s the one bar you can’t change, so we show it plainly and kindly. It’s a starting line, not a verdict, and always a range, never a date.

Download on the App StoreHow it moves the score

One of the four longevity components. Free to play. The Estimate unlocks the moment you add your dog. Educational and non-diagnostic.

The Tailmates longevity screen: a longevity-score dial, model standing, and modeled remaining-life range, with genetics as the baseline bar.
In one line

The hand your dog was dealt

What it measures

Genetics is breed, body size, age, and neuter status read against large actuarial life tables: the inherited rate-of-aging your dog started with. Big dogs age faster than small ones, and some breeds simply carry a longer or shorter baseline.

Why it matters for lifespan

It sets the curve everything else builds on, and it’s the one bar you can’t change. We show it plainly and kindly: it’s a starting line, not a verdict. The other three bars are where your daily choices move the needle.

Genetics is framed as fixed, not blamed. A shorter breed baseline isn’t something you did; it just means the levers you do control (weight, movement, and a lab-verified blood panel) matter even more. This bar is a context, never a countdown.

What it actually reads

Four inputs, all from what you already know

No DNA test required. The genetic baseline is built from signalment (breed, size, age, neuter status) and an optional genetics panel that sharpens it if you have one. Every input carries an evidence grade.

Evidence-graded: A = large cohort / cross-species mortality data · B = disease-cohort survival · C = mechanistic or extrapolated.

Breed lifespan

Grade A

Breed → life-table row

Where a breed sits on published life tables: the average years a dog of that breed tends to reach. Off-baseline and brachycephalic breeds get a real breed row; everyone else falls back to their size band.

Medium breed · ~12.7 yr line

Sample · from your dog’s profile

Body size

Grade A

Size → rate-of-aging (IGF-1)

Size isn't just a category, it's a rate-of-aging term. Big dogs age faster than small ones through the IGF-1 growth axis, so the same calendar year costs a Great Dane more biological time than a Jack Russell.

25–55 lb size band

Sample · from your dog’s profile

Brachycephaly

Grade A

Flat-faced conformation

A flat-faced build (French Bulldog, English Bulldog, Pug) is one of the single strongest breed-level lifespan modifiers, handled as a breed override on the baseline, never a hidden penalty.

Not brachycephalic

Sample · from your dog’s profile

Genetics panel

Grade C

Optional Embark / lab variants

When you have a real genetics panel, known high-impact risk variants sharpen the picture a little further. It's optional, evidence-graded C, and it can only nudge the baseline, never define your dog.

None on file (optional)

Sample · from your dog’s profile

Size is a rate-of-aging term

Why a calendar year costs a big dog more

Body size isn’t just a bucket, it changes how fast the clock runs. Through the IGF-1 growth axis, larger dogs age faster biologically than smaller ones, so the same birthday spends more of a large breed’s runway. It’s the clearest, best-evidenced piece of the genetic baseline.

Illustrative slopes, not a per-breed prediction. Your dog’s baseline is read from the full life-table curve.

Calendar yearsBiological age
Small dog · slowerLarge dog · faster
How it moves the score

Mostly in the baseline: the smallest separate weight

Here’s the honest, glass-box part: genetics matters enormously, yet it carries the smallest score weight of any dimension. That’s not a contradiction. It’s because breed and size are already baked into the actuarial baseline that anchors the whole estimate.

Putting a big separate genetics penalty on top would be double-counting the same signal. So the Genetic dimension carries a small weight (about 0.04), and its own extra adjustment is near-zero by construction. The genetics story lives inside the baseline, not in a second charge against it.

Where genetics sits in the weight vector

  • D4 Renal0.24
  • D2 Body0.18
  • D5 Liver0.16
  • D7 Inflammatory0.16
  • D3 Activity0.14
  • D6 Metabolic0.08
  • D1 Genetic0.04

A literature-prior weight vector, version-pinned and labeled “prior, not fitted.” Small weight, huge context.

The genetics bar, opened up

Glass-box
Genetics72
  • +Medium breed, long-lived line
  • +Mixed-breed credit (+0.8 yr)
  • -Entering senior years
Body condition86
Activity64
Bloodwork81

Illustrative. Every bar shows its top drivers in plain language.

How the baseline is assembled

It’s a glass box. Here’s the plain-language version of the math that turns your dog’s signalment into a life-expectancy range.

1

Look up the life-table row

Start from the breed's own life-table row when we have one, otherwise the row for its size band. This is the age-conditioned remaining-life curve for dogs like yours.

2

Add the mixed-breed credit

Mixed-breed dogs get a +0.8-year credit over a purebred of the same size, one of the more consistent findings in the data.

3

Bake in neuter status

Neuter is a baseline term, not a free bonus or penalty, read the way large cohorts actually record it, so the baseline stays honest.

4

Condition on your dog's age

Read the curve at your dog's exact age. Remaining life expectancy comes out as a range, never a single date, and everything else adjusts the deviation around it.

The clinical dimension

D1: Genetic & Constitutional

Inside the score, genetics is the first of seven clinical dimensions. Here’s the same card your vet reads, with the real markers, an illustrative SAMPLE read, and its evidence grade.

Sample
D1

Genetic & Constitutional

What it means. The inherited rate-of-aging prior: breed lifespan, body size as an aging-rate term, and brachycephaly burden, read against life tables built from millions of dogs. A genetics panel, when you have one, sharpens it further.

Why it matters. Breed and size set the baseline curve for how long a dog tends to thrive, so most of this signal lives in the actuarial baseline rather than a separate penalty, which is why it carries the smallest score weight even though it matters enormously.

Neutered · medium breedOptimal

Breed · Size · Age · Neuter status · Genetics panel

Evidence grade A (size→lifespan, breed LE) · C (variant-level deltas)

What the card is telling you

  • The sub-score answers one question: how favorable is this dog's genetic hand versus all dogs?
  • Its own life-expectancy delta is near-zero by design: the breed and size effect is already in the baseline.
  • A confirmed high-impact variant (from an optional panel) can add a small, grade-C nudge, never a diagnosis.
Sample

The read on the card is illustrative. Your dog’s real breed, size, and any genetics panel come from their profile and your vet.

What you can do about it

You can’t change genetics, but you can play the hand well

Genetics is the one bar with no “ways to improve” list, because it’s fixed. And that’s the point. What you can do is aim your effort at the bars that move: the harder the genetic hand, the more the modifiable levers matter.

  • Body condition: A well-studied body-condition signal. Tailmates uses a hand-set prior, not an individual intervention effect.
  • Activity: A daily movement signal you can track. Logged activity is a bounded input, not evidence that a walk changed lifespan.
  • Bloodwork: Your dog's inside story, lab verified. Catches quiet organ shifts early, and unlocks the lab-verified score with your vet in the loop.

Longevity Estimate

On Track
Genetics72
Body condition86
Activity64
BloodworkUnlock with your vet

Genetics is the fixed bar. Body condition and activity move every day; bloodwork stays locked until a lab-verified panel comes in.

The science, honestly

Straight answers about the baseline

Why does genetics carry the smallest weight if it matters so much?
Because most of it is already counted. Breed and size set the baseline curve everything else builds on, so putting a big separate genetics penalty on top would be double-counting. In the glass-box math, D1 Genetic carries the smallest dimension weight (about 0.04) and its own extra adjustment is near-zero by construction: the genetics signal lives inside the actuarial baseline, not in a second charge against it.
Is a short-lived breed a life sentence for my dog?
No individual dog's outcome is fixed by a breed average. Breed and size set the model baseline, while body condition, activity, and lab-validated bloodwork contribute additional signals. Those associations do not quantify how many years changing a signal would add.
Do I need a DNA test to get a genetics read?
No. The whole genetic baseline works from what you already know (breed, size, age, and neuter status), read against life tables. A genetics panel (like an Embark result) is purely optional: when present, known high-impact risk variants sharpen the read a little, but they're evidence-graded C and can only nudge the baseline, never define your dog.
How solid is the science behind the baseline?
The actuarial baseline (breed, size, sex, age against life tables built from millions of dogs) is the single best-evidenced part of the whole score, graded A. The size-to-lifespan and breed-lifespan effects are grade A; variant-level deltas from an optional panel are grade C and near-zero-weighted. We label every grade in-product, and it's a literature-anchored estimate, never an epigenetic clock and never a death date.

Please read

The short version: Tailmates is a wellness and fitness product, not a medical device and not a veterinary provider. The genetic baseline, like the whole Longevity Estimate, is educational and non-diagnostic. It is expressed as a range, never a single date, and it does not diagnose, treat, cure, or prevent any disease. It is not a substitute for examination, diagnosis, or treatment by a licensed veterinarian.

Back to the longevity scoreHow vets partner with usRead the full medical disclaimer

Meet the hand your dog was dealt.

See your dog’s genetic baseline

Free to play. The Estimate unlocks the moment you add your dog, no DNA test required. Review it with your vet whenever you’re ready.

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