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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 Black Flag Ant & Roach Killer Spray Safe for Pets?

Use with caution
Black Flag Ant & Roach Killer Spray is a dual-pyrethroid insecticide (imiprothrin 0.100% + lambda-cyhalothrin 0.025%) that the manufacturer's own label tells you to keep pets and aquariums away from before spraying.Dogs usually tolerate it once the spray is fully dry. Cats should be kept off treated surfaces until dry and ventilated, because cats can't efficiently metabolize pyrethroids. Birds should be removed from the room entirely, and fish tanks should be covered, since lambda-cyhalothrin is a Type II pyrethroid highly toxic to fish and hazardous to birds by inhalation. Spray surfaces only, never into the air or on a pet, and let everything dry before pets return. If your pet licks wet product or shows drooling, tremors, or twitching, call your vet or ASPCA Animal Poison Control.

At a Glance

  • Product: Ant & Roach Killer Spray by Black Flag · Black Flag
  • Active ingredient: Imiprothrin 0.100%, Lambda-cyhalothrin 0.025%
  • Re-entry: Typically until visibly dry (often ~1–2 hours) — follow the product label, which is the legal authority.
  • Cat owners: Cats differ — read the cat card below
The verdict for pet owners

The short, honest answer

Pet-safety score
55out 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

Black Flag's own label is unusually blunt: remove pets and cover aquariums before spraying.

Black Flag Ant & Roach Killer Spray is a standard dual-pyrethroid contact spray — imiprothrin (0.100%) and lambda-cyhalothrin (0.025%) — with the same class-level pet risks as other pyrethroid aerosols. What sets this label apart is how explicit it is: it directly instructs removing pets and covering aquariums before spraying, and not allowing people or pets to contact treated surfaces until the spray has dried. Dogs generally tolerate labeled use once dry; cats, birds, and fish are the real concern.

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
  • CatsAvoid
  • Small mammalsCaution
  • BirdsAvoid
  • FishAvoid
DogsCaution

Generally tolerated once fully dry

Dogs metabolize pyrethroids relatively well, and the label directs keeping pets off treated surfaces until the spray has dried. The main risk is a dog licking wet product. Keep dogs off treated surfaces until dry.

NPIC lambda-cyhalothrin fact sheet; manufacturer label

CatsAvoid
Cats differ — added blood-disorder risk

Keep cats off until fully dry and ventilated

Lambda-cyhalothrin is a Type II pyrethroid, and cats are the most sensitive common pet to this class because they lack efficient glucuronidation to clear it. Wet residue on paws or fur is then ingested during grooming.

Merck Veterinary Manual — pyrethrin/pyrethroid toxicosis

Small mammalsCaution

Remove during application and until dry

Small body size and high metabolic and respiratory rates raise sensitivity to airborne aerosol and residue. Move enclosures out of the room during treatment and until it's dry and ventilated.

NPIC lambda-cyhalothrin fact sheet

BirdsAvoid

Label explicitly says to remove pets before spraying

Black Flag's own label instructs removing pets and covering aquariums before spraying. Birds are especially sensitive to aerosolized pyrethroids by inhalation, so remove them from the home area entirely before use.

Black Flag product label; NPIC avian-toxicology guidance

FishAvoid

Cover aquariums — the label says so directly

The label directs covering aquariums before spraying. Lambda-cyhalothrin and imiprothrin are both highly toxic to fish and aquatic invertebrates even at trace levels.

Black Flag product label; NPIC lambda-cyhalothrin fact sheet

The chemistry, in plain terms

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

Imiprothrin
0.100% · Pyrethroid (Type I)Fast contact knockdown
Lambda-cyhalothrin
0.025% · Pyrethroid (Type II)Residual kill, up to 3 months on treated surfaces
Lambda-cyhalothrin

A Type II pyrethroid that overstimulates the nervous system. In sensitive pets, especially cats, it can cause drooling, tremors, twitching, and hyperexcitability, and it is hazardous to fish and other aquatic life.

Most at riskCatsFishBirds

NPIC lambda-cyhalothrin fact sheet

Imiprothrin

A fast-acting Type I pyrethroid for quick knockdown, with the same class-level nervous-system effects. Cats are the most vulnerable pet, and the aerosol/petroleum-distillate carrier adds an inhalation and GI-irritation concern when wet.

Most at riskCatsBirds

NPIC pyrethrins/pyrethroids fact sheet

The actionable core

How to use it safely around pets

Black Flag's label is direct about pets: remove them and cover aquariums before spraying, apply to surfaces only (never as a room spray), and keep people and pets off treated surfaces until the spray has dried.

Remove pets and cover aquariums first

Take pets — including caged birds and small mammals — out of the treatment area, and cover any fish tank, exactly as the label instructs.

Watch out
Birds and fish should not remain in the room during application.

Spray surfaces only, never as a room spray

Apply along baseboards, cracks, crevices, and other insect pathways. The label specifies this is not a broadcast or room spray, and to point it away from people, pets, and plants.

Watch out
Do not apply to food or food-prep surfaces.

Let it dry completely before pets return

The label states not to allow people or pets to contact treated surfaces until the spray has dried. Drying is the single most important pet-safety step.

Watch out
Wet pyrethroid residue is the main exposure route for cats grooming their paws.

Wipe food-contact areas and store safely

Wipe down any surface a pet eats or drinks from, and store the can sealed, upright, and out of reach.

Watch out
A punctured or heated aerosol can is a separate hazard — never store near heat.
The re-entry rule

Do not allow people or pets to contact treated surfaces until the spray has dried, per the product label.

Typically until visibly dry (often ~1–2 hours) — follow the product label, which is the legal authority.

Cats, birds, and fish warrant extra time and ventilation; when in doubt, keep them out longer.

Rather not spray pyrethroids around your pets?

Anchor's licensed NH technicians use targeted, pet-conscious placement instead of whole-room spraying.

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.

  • Drooling or hypersalivation

    Often the earliest sign in cats

    Moderate

  • Paw flicking, ear or skin twitching

    Moderate

  • Vomiting

    Moderate

  • Tremors

    Serious

  • Hyperexcitability or agitation

    Serious

  • Seizures

    Most likely in cats with significant exposure — seek emergency care

    Emergency
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 ate, licked, or walked through this product, act now — bring the can or a photo of the label 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 walked through wet product

    Wipe the residue off paws/fur with a damp cloth to stop further grooming ingestion, then call your vet or a pet poison hotline for guidance. Do not induce vomiting unless a professional tells you to.

  • Your cat is drooling, twitching, or tremoring

    Treat as urgent — cats are the most pyrethroid-sensitive pet. Call your vet or ASPCA Animal Poison Control immediately and bring the can or a photo of the label.

  • A bird was in the room during spraying

    Move the bird to fresh air at once and contact an avian vet or a pet poison hotline — birds can be affected by inhalation alone.

In the next 60 seconds

  1. Get your pet away from the treated area and any wet product.
  2. Gently wipe wet residue off paws and fur to stop grooming ingestion.
  3. Do NOT induce vomiting unless a veterinarian or poison expert tells you to.
  4. Have the product name and EPA registration number (from the can) 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.

Enclosed/tamper-resistant bait stations

Safer

Enclosed bait (kept out of pet reach)

The active is sealed inside a station instead of sprayed across surfaces pets touch, sharply cutting contact and grooming exposure.

Still contains an insecticide — place where pets and children can't pry them open.

Mechanical exclusion + sanitation

Safer

Non-chemical

Caulking entry points, fixing moisture, and removing food removes the reason ants and roaches come in — zero pet-toxicity.

Slower than a spray and needs consistency; best paired with targeted baiting.

Plant-based (EPA 25(b) minimum-risk) sprays

Safer

Botanical / minimum-risk

Formulated from plant oils rather than pyrethroids, with a lower systemic-toxicity profile for mammals.

"Plant-based" is not "harmless" — concentrated essential oils can still affect cats; let surfaces dry.

Professional pet-conscious treatment (Anchor Pest Services)

Safer

Licensed professional service

Licensed applicators use targeted placement and pet-aware protocols instead of homeowner broadcast spraying, minimizing where and how much product a pet can contact.

A service, not a product — request a pet-safety-focused plan.

Local to New Hampshire

Pet-safe pest control in New Hampshire

Carpenter ants are New Hampshire's most common structural ant and a leading reason homeowners reach for an ant-and-roach can like this one. Using a general-use retail spray on your own home is legal, but anyone applying pesticides for hire in New Hampshire must be licensed by the NH Department of Agriculture, Markets & Food (NHDAMF) Division of Pesticide Control under RSA 430. Anchor Pest Services is NH-licensed (#782664) and uses targeted placement instead of whole-room spraying across Manchester, Nashua, Concord, and the surrounding towns.

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(5)
  1. [1]
    Black Flag — Ant & Roach Killer product page

    Verified actives (imiprothrin 0.100%, lambda-cyhalothrin 0.025%); label directive to remove pets and cover aquariums

    manufacturerverified 2026-07-13
  2. [2]
    Black Flag — Ant & Roach Killer Safety Data Sheet

    Ingredient confirmation and use directions

    manufacturerverified 2026-07-13
  3. [3]
    NPIC — Lambda-cyhalothrin General Fact Sheet

    Pyrethroid toxicity, fish/bird hazard

    npicverified 2026-07-13
  4. [4]
    NPIC — Pyrethrins and Pyrethroids Fact Sheet

    Class-level mode of action and pet risk

    npicverified 2026-07-13
  5. [5]
    Merck Veterinary Manual — Pyrethrin and Pyrethroid Toxicosis

    Cat glucuronidation deficiency; clinical signs

    veterinaryverified 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

Skip the Guesswork — and the Wet-Residue Risk

DIY sprays put the pet-safety burden on you. Anchor Pest Services treats ants and roaches with targeted, pet-aware methods across southern and central New Hampshire. Family-owned since 2017, NH license #782664.

Get a Free Pet-Safe Inspection(603) 785-0118
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