Skip to content
Anchor Pest Services logo
(603) 785-0118
A curious dog and cat at home near a kitchen cabinet where pest-control products are used
Daniel Brady · NH-Licensed Pesticide Applicator · License #782664
Reviewed by Daniel Brady

Is Precor IGR Concentrate for Fleas by Zoecon Safe for Pets?

Use with caution
Precor IGR Concentrate for Fleas is not a pyrethroid — it's an insect growth regulator (methoprene) that prevents flea larvae from developing into adults.It's very low in toxicity to mammals, birds, and (per current EPA assessment) fish, so it doesn't carry the class-level cat-sensitivity alarm that applies to most other products in this category. The meaningful caution is proximity, not chemistry: Precor is applied directly to carpets, rugs, upholstery, and pet bedding, so the wet petroleum-distillate solvent carrier is a real concern until everything dries fully. Remove pets and their bedding before treating, wash bedding before reuse, and never apply this premise concentrate directly to an animal — flea treatment on the pet itself should come from your veterinarian. If a pet ingests the concentrate, call your vet or a pet poison hotline.

At a Glance

  • Product: Precor IGR Concentrate for Fleas by Zoecon · Zoecon
  • Active ingredient: (S)-Methoprene 1.2%
  • Re-entry: Re-entry after visibly dry, per the Precor label.
  • Cat owners: Cats differ — read the cat card below
The verdict for pet owners

The short, honest answer

Pet-safety score
74out of 100
Use with caution

The score rolls up every per-species verdict below, weighted by the honest exposure that matters — a chewed-open tube, not a hidden dab — and is checked against the EPA label and veterinary toxicology.

The verdict
Use with caution

A growth regulator with very low mammalian toxicity — but it's applied exactly where pets live, so drying time still matters.

Precor IGR Concentrate for Fleas is (S)-methoprene 1.2%, an insect growth regulator (EPA Reg. No. 2724-352) that stops flea larvae from maturing rather than killing adult fleas outright or acting as a nerve poison. Like Gentrol, this is chemically distinct from the pyrethroid barrier sprays in this category and is well established as very low in mammalian, avian, and acute aquatic toxicity. What makes Precor's pet-proximity context different from a foundation barrier spray is that it's applied directly to carpets, upholstery, and pet bedding — exactly where pets live — so the wet petroleum-distillate solvent carrier and drying time deserve real attention even though the IGR active itself is low-risk.

General information, not veterinary advice. For a suspected exposure, contact your veterinarian or a pet-poison hotline. Verdict checked 2026-07-13 against the EPA label and veterinary toxicology.

Safety by pet

It's not one answer — it's one per animal

Cats, birds, and fish routinely differ sharply from dogs. That contrast is the whole point of this scorecard, and no manufacturer page draws it.

Scorecard at a glance
  • DogsCaution
  • CatsCaution
  • Small mammalsCaution
  • BirdsSafe
  • FishCaution
DogsCaution

Very low IGR toxicity; the wet solvent-carrying spray is the real caution

Methoprene has very low toxicity to mammals. Because Precor is applied directly to carpets and bedding where dogs sleep and roll, keep dogs off treated surfaces until they've fully dried — the solvent carrier, not the IGR, is the practical concern.

NPIC Methoprene General Fact Sheet

CatsCaution
Cats differ — added blood-disorder risk

No pyrethroid-style feline sensitivity for methoprene

Methoprene does not carry the class-level feline-metabolism concern that applies to pyrethroids elsewhere in this category. Still keep cats off treated bedding and carpet until fully dry, and launder pet bedding before reuse.

NPIC Methoprene General Fact Sheet

Small mammalsCaution

Low intrinsic IGR toxicity; keep off wet surfaces

Keep small pets off treated surfaces until fully dry. The IGR active itself has low intrinsic toxicity to this group, per class-level data.

NPIC Methoprene General Fact Sheet

BirdsSafe

EPA review: practically non-toxic to avian species

EPA's S-methoprene registration review classifies the compound as practically non-toxic to avian species. Still keep cages away from wet spray and solvent fumes during application.

EPA S-methoprene registration review

FishCaution

EPA removed older fish-water restrictions; still avoid direct contamination

Methoprene degrades rapidly, and EPA has removed older restrictions on use near fish-bearing waters. Even so, avoid letting the concentrate itself contaminate an aquarium or waterway.

EPA methoprene reregistration update

The chemistry, in plain terms

What's in it — and what it does to pets

(S)-Methoprene
1.2% · Insect growth regulator (juvenile hormone analog) — not a pyrethroidStops flea larvae from maturing into adults
(S)-Methoprene

A terpenoid insect growth regulator (juvenile hormone analog) that prevents flea larvae from maturing into biting, reproducing adults; it does not kill adult fleas directly and is not a nerve poison. It is well established as very low in mammalian, avian, and (per current EPA assessment) acute aquatic toxicity.

NPIC Methoprene General Fact Sheet; EPA S-methoprene registration review

The actionable core

How to use it safely around pets

Precor is intentionally applied to flea harborage — carpet, throw rugs, upholstery, and pet sleeping/bedding areas — which is a different pet-proximity context than a foundation barrier spray. Treating the premises with methoprene is separate from treating the animal.

Remove pets and their bedding before treating

Take pets out of the room, and remove or set aside pet bedding before applying the diluted spray to carpets, rugs, and upholstery.

Watch out
Wash or replace pet bedding after treatment rather than treating it directly with this premise concentrate.

Apply as directed to flea harborage areas

Treat carpets, rugs, upholstered furniture, and along baseboards as the label directs.

Watch out
Avoid direct application to food or water bowls.

Keep pets off treated surfaces until fully dry

The label directs avoiding contact with treated surfaces until dry. Let carpets and furniture dry fully before pets return.

Watch out
The wet solvent-carrying concentrate, not the IGR, is the practical caution during this window.

Never apply this premise product to the pet itself

Fleas on your pet need a separate, EPA-registered on-animal product chosen with your veterinarian — never this concentrate applied directly to fur or skin.

Watch out
Confusing a premise treatment with an on-animal product is a real and avoidable risk.
The re-entry rule

Avoid contact with treated surfaces until fully dry; wash or replace pet bedding before reuse.

Re-entry after visibly dry, per the Precor label.

Because it's applied to carpet and bedding, drying time matters more here in practice than for a foundation barrier spray a pet rarely touches directly.

Want a flea premise treatment handled with pet-bedding-aware care?

Anchor's licensed NH technicians combine IGR treatment with sanitation guidance — and always point you to your vet for on-animal flea care.

Get a Free Pet-Safe Inspection(603) 785-0118
If something's off

Symptoms to watch for

A sign, its urgency, and what to do — never a diagnosis. When in doubt, the emergency panel below is one tap away.

  • The IGR active is not expected to cause acute signs

    Methoprene itself has very low mammalian toxicity

    Mild

  • Drooling

    If the undiluted petroleum-distillate concentrate is ingested

    Moderate

  • Vomiting

    Moderate

  • Lethargy

    Moderate

  • Coughing or labored breathing

    Aspiration risk from the solvent carrier

    Serious
If your pet was exposed

Act now — call a vet or a pet-poison line

Do not induce vomiting unless told to

If your pet ingested this concentrate or contacted wet treated surfaces, act now — bring the product label or container when you call. This page is general information, not veterinary advice — for a suspected exposure, contact your veterinarian or ASPCA Animal Poison Control (888-426-4435) right away.

What each situation calls for

  • Your pet licked or drank some of the undiluted concentrate

    Do not induce vomiting — aspiration of the petroleum-distillate solvent can be more dangerous than the ingestion itself. Call your vet or a pet poison hotline immediately.

  • Your pet contacted treated carpet or bedding while it was still wet

    Keep the pet off the area until fully dry and monitor for drooling or GI upset; call your vet if signs appear.

  • You accidentally applied the concentrate directly to your pet instead of a veterinary flea product

    Contact your vet or a pet poison hotline immediately — this premise product is not formulated or labeled for on-animal use.

In the next 60 seconds

  1. Get your pet away from the concentrate and any wet treated carpet or bedding.
  2. Do NOT induce vomiting — aspiration risk from the solvent carrier can be more dangerous than ingestion.
  3. Watch closely for coughing, labored breathing, or drowsiness.
  4. Have the product name and EPA registration number ready.
  5. Call your veterinarian or one of the hotlines below.
Lower-risk options

Safer pet-friendly alternatives

Honest options that reduce or remove pet-toxicity — no affiliate hype, real caveats included.

Veterinarian-recommended on-pet flea preventives

Safer

Vet-directed, on-animal product

A product formulated and labeled specifically for use on the animal, chosen with your vet, is the appropriate way to treat fleas on your pet — never this premise concentrate.

Requires a separate purchase and, often, a vet consult.

Thorough, frequent vacuuming

Safer

Non-chemical

Removes flea eggs, larvae, and pupae from carpet and furniture with zero pet toxicity.

Needs to be frequent and thorough to meaningfully reduce a flea population.

Hot-washing pet bedding

Safer

Non-chemical

Heat kills fleas and eggs in bedding without any chemical exposure.

Only addresses bedding, not the wider carpet/furniture environment.

Professional integrated flea program by Anchor Pest Services

Safer

Licensed professional service

Combines IGR premise treatment with sanitation guidance, applied by a licensed technician rather than DIY.

A service, not a substitute for veterinary on-animal flea treatment.

Local to New Hampshire

Pet-conscious flea control in New Hampshire

Flea pressure in New Hampshire builds through the warm months, riding indoors on pets that roam wooded NH yards. A premise IGR like Precor is a professional concentrate, and applying pesticides for hire in NH requires a commercial applicator certified by the NH Department of Agriculture, Markets & Food (NHDAMF) Division of Pesticide Control under RSA 430. Anchor Pest Services (License #782664) combines IGR premise treatment with sanitation guidance across Manchester, Nashua, Concord, and the surrounding towns — always paired with the reminder that on-animal flea treatment belongs with your veterinarian.

Anchor Pest Services

NH-licensed applicator #782664 (NHDAMF, RSA 430) · NEPMA member · family-owned since 2017.

Service Area Map

Southern New Hampshire

BristolPop. 3,200LoudonPop. 5,500ConcordPop. 43,900HooksettPop. 14,800GoffstownPop. 18,000AuburnPop. 5,700ManchesterPop. 115,600BedfordPop. 23,300LitchfieldPop. 8,500AmherstPop. 11,300DerryPop. 34,500MilfordPop. 15,700HudsonPop. 25,600NashuaPop. 91,100SalemPop. 30,000HQCityHover for info
Common Questions

Frequently asked questions

Sources(6)
  1. [1]
    Zoëcon Precor IGR Concentrate product page

    (S)-methoprene 1.2%, EPA Reg. No. 2724-352, application to carpet/upholstery/pet sleeping areas (facts only, not the verdict)

    manufacturerverified 2026-07-13
  2. [2]
    Precor IGR product label

    "Avoid contact with treated surfaces until dry" directive; on-animal treatment guidance

    manufacturerverified 2026-07-13
  3. [3]
    Precor IGR Safety Data Sheet

    Terpenoid IGR classification, petroleum-distillate solvent composition

    manufacturerverified 2026-07-13
  4. [4]
    NPIC — Methoprene General Fact Sheet

    Low mammalian toxicity, relatively non-toxic to birds

    npicverified 2026-07-13
  5. [5]
    EPA — Methoprene reregistration eligibility update

    Removal of older fish-water use restrictions

    epa_labelverified 2026-07-13
  6. [6]
    EPA S-Methoprene registration review

    "Practically non-toxic to avian species" classification

    epa_labelverified 2026-07-13

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

Verify license

Last updated 2026-07-13

Pet-Safe Professional Pest Control

Flea Treatment Belongs in Two Places — the Home and the Vet

Anchor Pest Services handles the premise side of flea control with pet-conscious IGR treatment across southern and central New Hampshire, while your veterinarian handles on-animal care. Family-owned since 2017, NH license #782664.

Get a Free Pet-Safe Inspection(603) 785-0118
  • Pet-conscious targeted placement
  • NH-licensed applicators (#782664)
  • Free inspection — same-day service across southern NH

NH License #782664 · No obligation · We answer in person

Keep Exploring

Your next step

Call (603) 785-0118Get an Inspection