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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 Home Defense Ant, Roach & Spider Killer by Ortho Safe for Pets?

Use with caution
Home Defense Ant, Roach & Spider Killer by Ortho is an indoor aerosol contact spray combining cypermethrin, prallethrin, and botanical pyrethrins, plus antimicrobial quaternary-ammonium compounds.Dogs generally tolerate labeled use once treated surfaces are fully dry. Cats need real caution — three pyrethrin/pyrethroid actives compound the class-level feline sensitivity, and the quats can irritate a cat's mouth or eyes if licked while wet. Because this is an aerosol, birds face an elevated inhalation risk and should be removed from the room entirely before spraying, and fish should be covered or moved, since this pyrethroid/pyrethrin combination is extremely toxic to aquatic life. If a pet contacts wet product or shows drooling, tremors, or twitching, call your vet or ASPCA Animal Poison Control immediately.

At a Glance

  • Product: Home Defense Ant, Roach & Spider Killer by Ortho · Ortho
  • Active ingredient: Cypermethrin 0.030%, Prallethrin (ETOC) 0.011%, Pyrethrins 0.011%
  • Re-entry: Typically until visibly dry — 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
50out 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 three-active aerosol contact killer — dogs tolerate it dry, but cats, birds, and fish need real caution.

This is Ortho's aerosol contact spray (EPA Reg. No. 239-2752) — distinct from Ortho's bifenthrin liquid barrier products — combining two pyrethroids (cypermethrin, prallethrin) with botanical pyrethrins and quaternary-ammonium sanitizers. Dogs generally tolerate labeled indoor use once surfaces are dry. Cats face the class-level pyrethroid sensitivity plus an added oral-irritant risk from the quats if they lick wet residue. Because it's an aerosol, the bird-inhalation hazard is elevated compared with a liquid barrier spray, and the pyrethrin/pyrethroid content makes it extremely toxic to fish.

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

Typically tolerated once fully dry

The pyrethrin/pyrethroid concentrations here are low, and dogs generally tolerate the class once surfaces have dried. The quaternary-ammonium sanitizers can irritate the mouth or eyes if a dog licks wet residue.

NPIC pyrethroid class references; Ortho ingredient statement

CatsAvoid
Cats differ — added blood-disorder risk

Keep cats out until fully dry and ventilated

This product combines two pyrethroids and botanical pyrethrins — cats' limited liver glucuronidation makes even low concentrations of any one of these worth avoiding, and having three actives compounds that caution. The added quaternary-ammonium sanitizers can also irritate a cat's mouth if wet residue is licked during grooming.

Merck Veterinary Manual; MSPCA-Angell pyrethrin toxicity in cats

Small mammalsCaution

Keep off treated surfaces until dry

Small-bodied pets are more sensitive per pound of body weight to both the pyrethrin/pyrethroid actives and the quats. Keep off treated surfaces until fully dry and ventilated.

NPIC pyrethroid class references

BirdsAvoid

Remove birds before spraying — aerosol droplets are the acute risk

Birds are exquisitely sensitive to airborne agents, and aerosol droplets plus propellant are the acute avian hazard for this product. Do not spray in rooms with birds present, and ventilate thoroughly before returning them.

NPIC; veterinary avian-toxicology guidance

FishAvoid

Cover or remove aquariums — extremely toxic to fish

The pyrethrin/pyrethroid class is extremely toxic to fish and aquatic invertebrates. Cover aquariums and shut off air pumps before and during any indoor aerosol use.

NPIC pyrethroid fact sheets

The chemistry, in plain terms

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

Cypermethrin
0.030% · Pyrethroid (Type II)Contact kill
Prallethrin (ETOC)
0.011% · Pyrethroid (Type I)Fast knockdown
Pyrethrins
0.011% · Botanical insecticideFast knockdown
Cypermethrin

A Type II pyrethroid that overstimulates the insect nervous system; in sensitive pets, especially cats, it can cause drooling, tremors, and hyperexcitability, and it is highly toxic to fish.

Most at riskCatsFish

NPIC cypermethrin fact sheet

Prallethrin (ETOC)

A fast-knockdown Type I pyrethroid; shares the class-level nervous-system mode of action, with cats as the most sensitive common pet.

Most at riskCatsBirds

NPIC pyrethrins/pyrethroids fact sheet

Pyrethrins

A botanical (plant-derived) insecticide with the same general nervous-system mode of action as synthetic pyrethroids; "plant-based" does not mean harmless — cats remain sensitive.

Most at riskCatsBirdsFish

Merck Veterinary Manual — plant-derived insecticide toxicosis

The actionable core

How to use it safely around pets

This is an indoor household aerosol meant for spot/contact use, not a broadcast spray — used carefully, with pets removed and surfaces dried, the pet risk drops sharply.

Remove pets before spraying, especially birds and fish

Take all pets out of the room before applying, and remove birds and cover fish tanks entirely — aerosol droplets are the primary hazard for both.

Watch out
Do not spray in the same room as a bird cage or an open aquarium.

Spray surfaces only, indoor household use

Apply along baseboards, cracks, and crevices as the label directs — never into the air or directly on a pet.

Watch out
Do not apply where it will contact pets directly or via drift; remove or cover pet food and dishes.

Let it dry completely and ventilate

Keep pets out until treated surfaces are fully dry and the room has been aired out.

Watch out
Wet residue on paws or fur is the main route for cats grooming the product off.

Wipe food-contact areas before returning pets

Wipe any surface a pet eats or drinks from before letting pets back into the room.

Watch out
Quats and pyrethroid residue can both cause oral irritation or GI upset if licked.
The re-entry rule

Keep pets off treated surfaces until the spray is fully dry and the room is ventilated; keep birds and fish out of the room entirely during and after application.

Typically until visibly dry — follow the product label, which is the legal authority.

Because this is an aerosol, ventilation time matters as much as surface-dry time, especially for birds.

Rather not spray a three-active aerosol around cats and birds?

Anchor's licensed NH technicians use targeted, pet-conscious placement instead of aerosol 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

  • Vomiting or diarrhea

    Moderate

  • Paw flicking or ear twitching

    Moderate

  • Tremors

    Serious

  • Incoordination

    Serious

  • Pawing at the mouth

    If the quats are licked while wet

    Moderate
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. Do not induce vomiting unless told to.

  • Your cat is drooling, twitching, or tremoring

    Treat as urgent — 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 immediately 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 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

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.

Professional targeted treatment by Anchor Pest Services

Safer

Licensed professional service

A licensed applicator can target ants, roaches, and spiders with precise placement instead of a homeowner aerosol.

A service, not a product.

Physical removal for spiders

Safer

Mechanical

Individual spiders can often be removed or excluded without any chemical, with zero pet toxicity.

Not practical for a larger roach or ant infestation.

Sanitation and exclusion

Safer

Non-chemical

Removing food sources and sealing entry points reduces the pest pressure that drives repeat aerosol use.

Slower than a spray; best paired with targeted treatment.

Local to New Hampshire

Pet-safe pest control in New Hampshire

Carpenter ants, cockroaches, and cellar and cobweb spiders are among the indoor pests New Hampshire homeowners spray for as the seasons turn cold. A homeowner may legally use a general-use retail aerosol on their own property, but under RSA 430 any pesticide application done for hire in New Hampshire must be performed by an applicator licensed by the NH Department of Agriculture, Markets & Food (NHDAMF) Division of Pesticide Control. Anchor Pest Services is NH-licensed (#782664) and provides pet-conscious treatment 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(6)
  1. [1]
    EPA Registered Product Label — Ortho Home Defense Ant, Roach & Spider Killer (Reg. No. 239-2752)

    Verified actives (cypermethrin 0.030%, prallethrin 0.011%, pyrethrins 0.011%)

    epa_labelverified 2026-07-13
  2. [2]
    Ortho — ingredient statement, Home Defense Ant, Roach & Spider Killer

    Ingredient confirmation including quaternary-ammonium sanitizers (facts only, not the verdict)

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

    Pyrethroid toxicity, cat sensitivity, 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 — Plant-Derived Insecticide Toxicosis in Animals

    Cats most sensitive among pets to pyrethrins/pyrethroids

    veterinaryverified 2026-07-13
  6. [6]
    MSPCA-Angell — Pyrethrin Toxicity in Cats

    Feline glucuronidation deficiency mechanism

    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

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