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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 Contrac All-Weather Blox Rodenticide Safe for Pets?

Not pet-safe
No — Contrac All-Weather Blox is a real chemical toxicant, not a pet-safe product under any placement a homeowner should attempt alone.Its active ingredient, bromadiolone, is a second-generation anticoagulant that persists in tissue longer than older rat poisons, giving it a materially higher secondary-poisoning risk: a dog or cat that eats even part of a poisoned rodent can be affected. The paraffin block is also highly palatable, so primary ingestion by a dog is a real risk if it's ever accessible. This is a professional/restricted-use product line, best handled by a licensed applicator inside a locked, tamper-resistant station — not placed loose in a home with pets. Vitamin K1 is an effective antidote, but only with prompt veterinary treatment.

At a Glance

  • Product: Contrac All-Weather Blox Rodenticide by Bell Laboratories · Bell Laboratories
  • Active ingredient: Bromadiolone 0.005%
  • Re-entry: Ongoing — for the full duration the bait is in service.
  • Cat owners: Cats differ — read the cat card below
The verdict for pet owners

The short, honest answer

Pet-safety score
15out of 100
Not pet-safe

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
Not pet-safe

A second-generation anticoagulant bait — highly palatable, professional-grade, and never safe for a pet to access.

Contrac All-Weather Blox is a paraffinized bait block containing bromadiolone 0.005% (EPA Reg. No. 12455-79), a second-generation anticoagulant. Second-generation actives persist far longer in rodent tissue than older anticoagulants, which is precisely why they carry the highest documented secondary-poisoning risk to dogs, cats, and wildlife that eat a poisoned rodent. This is primarily a pest-management-professional product, not a casual consumer purchase, and it is acceptable only inside a genuinely tamper-resistant station, professionally placed — never as loose or freely accessible bait.

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
  • DogsAvoid
  • CatsAvoid
  • Small mammalsAvoid
  • BirdsAvoid
  • FishCaution
DogsAvoid

Highly palatable block — the most commonly poisoned pet by rodenticides in general

Dogs are the pet most often primarily poisoned by rodenticide bait in veterinary literature, and bromadiolone's second-generation persistence adds risk if a dog also eats a poisoned rodent later.

Merck Veterinary Manual — Anticoagulant Rodenticide Poisoning in Animals

CatsAvoid
Cats differ — added blood-disorder risk

Higher secondary-poisoning risk from eating a poisoned rodent

Cats are more often poisoned secondarily — by eating a bromadiolone-affected rodent — than by chewing bait directly, and second-generation actives like bromadiolone persist longer in prey tissue, raising that risk.

NPIC Rodenticides fact sheet

Small mammalsAvoid

Target taxon — any exposure is lethal

A pet rat, mouse, hamster, or guinea pig is biologically close enough to the target species that any accessible bait is a direct, undiminished hazard.

NPIC Rodenticides fact sheet

BirdsAvoid

Extremely toxic to birds — documented raptor secondary poisoning

Bromadiolone is labeled extremely toxic to birds, and raptors and scavenging birds eating poisoned rodents is a well-documented wildlife issue.

EPA product label; NPIC Rodenticides fact sheet

FishCaution

Keep bait and contaminated material away from water

The label lists toxicity to wildlife and an aquatic hazard; the practical risk indoors is bait or runoff reaching water, not direct ingestion by a fish.

EPA product label

The chemistry, in plain terms

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

Bromadiolone
0.005% · Anticoagulant rodenticide (second-generation)Blocks vitamin K-dependent blood clotting in rodents
Bromadiolone

A second-generation anticoagulant that blocks the vitamin K cycle the body needs to clot blood, leading to internal bleeding over one to several days. Second-generation actives are more potent and persist far longer in tissue than first-generation actives like warfarin, which is why they carry materially higher secondary-poisoning risk to a pet that eats a poisoned rodent. Vitamin K1 is an effective antidote, but only with prompt, veterinarian-directed treatment.

Most at riskDogsCatsBirds

Merck Veterinary Manual — Anticoagulant Rodenticide Poisoning in Animals; NPIC Rodenticides fact sheet

The actionable core

How to use it safely around pets

This is a professional-grade, second-generation anticoagulant. It should never be placed loose, and ideally is handled by a licensed applicator rather than a homeowner with pets in the house.

Use only inside a genuinely tamper-resistant station

The block must be secured on a bait rod inside a locked, Tier-1 tamper-resistant station — never placed loose on a surface a pet could reach.

Watch out
An unsecured block is a direct primary-poisoning risk to any dog in the house.

Place and monitor professionally

Given the professional/restricted-use status of this product line and its high secondary-poisoning risk, placement and monitoring by a licensed pest control applicator is the safer route in homes with pets.

Watch out
Confirm current state sale/use restrictions before purchase — this product line is not for sale in some states.

Collect and dispose of rodent carcasses promptly

Wearing gloves, collect and dispose of any dead rodents quickly to reduce the window for a pet or wildlife to find and eat one.

Watch out
A poisoned rodent remains hazardous to whatever eats it.

Never place near an area pets can access, even briefly

Because of the secondary-poisoning risk, keep treated areas off-limits to pets entirely, not just 'until dry.'

Watch out
There is no re-entry timing that makes an active anticoagulant bait station safe for unsupervised pet access.
The re-entry rule

There is no safe 'dry time' for an anticoagulant bait station — it remains hazardous for as long as it's active, and pets should never have unsupervised access to it.

Ongoing — for the full duration the bait is in service.

If bait or a treated rodent is ever accessible to a pet, treat it as an active exposure and call a vet or poison hotline.

Rather not manage rodenticide bait around your pets?

Anchor's licensed NH technicians place and monitor rodent control so your pets never have to be near the bait.

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.

  • Lethargy or weakness

    Moderate

  • Pale gums

    Moderate

  • Unexplained bruising

    Serious

  • Bleeding from the nose or gums

    Serious

  • Blood in vomit or stool

    Serious

  • Coughing or labored breathing (internal/chest bleeding)

    Seek emergency veterinary care immediately; onset is often delayed 1–5 days

    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 bait, chewed into a station, or may have eaten a poisoned rodent, act now — bring the packaging or a photo of the label when you call. This page is general information, not veterinary advice — for a suspected poisoning, contact your veterinarian or ASPCA Animal Poison Control (888-426-4435) right away.

What each situation calls for

  • Your pet ate bait or you suspect it chewed a block

    Call your vet or ASPCA Animal Poison Control immediately, even with no visible signs — anticoagulant symptoms are typically delayed 1–5 days, and Vitamin K1 treatment is most effective started early.

  • Your pet may have eaten a poisoned rodent

    Treat as a real secondary-poisoning risk given bromadiolone's tissue persistence. Call your vet or a pet poison hotline right away and describe what happened.

In the next 60 seconds

  1. Get your pet away from the bait, station, or any dead/dying rodent.
  2. Do NOT induce vomiting or attempt any home treatment unless a veterinarian or poison expert tells you to.
  3. Save the packaging — the EPA registration number and active ingredient (an anticoagulant, e.g. bromadiolone, diphacinone, difethialone, or brodifacoum) tell the vet exactly which antidote pathway to start.
  4. Call your veterinarian or one of the hotlines below right away, even if your pet seems fine — anticoagulant symptoms are often delayed 1–5 days.
Lower-risk options

Safer pet-friendly alternatives

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

Victor Tin Cat live-catch trap

Safer

Live-catch, no toxicant

No poison and no lethal mechanism — mice are captured alive in an enclosed box, the safest format in this cluster for a home with pets.

Requires daily checks to release captured mice promptly.

Enclosed electronic traps

Safer

Electronic, no toxicant

The kill mechanism sits in a recessed chamber sized for a rodent, generally out of reach for typical dogs and cats.

Keep away from very small pets who could fit inside the entrance.

First-generation anticoagulant bait (if a toxicant is unavoidable)

Safer

Lower secondary-risk bait

First-generation actives like warfarin metabolize faster and persist less in tissue than second-generation bromadiolone, somewhat lowering secondary-poisoning risk.

Still a real primary-ingestion hazard — belongs in a locked station, not loose.

Professional pet-safe rodent control (Anchor Pest Services)

Safer

Licensed professional service

A licensed applicator can place, secure, and monitor a product like this correctly, and can weigh whether a non-toxicant option fits your situation instead.

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

Local to New Hampshire

Pet-safe rodent control in New Hampshire

Bromadiolone is a second-generation anticoagulant — the class EPA restricted from loose consumer sale in 2011 to reduce non-target harm. In New Hampshire that harm reaches the barred owls, red-tailed hawks, and great horned owls that hunt and scavenge rodents statewide, since a poisoned mouse or rat becomes a secondary-exposure risk to those raptors. Anchor Pest Services serves Manchester, Nashua, Concord, and the surrounding towns with licensed, pet-conscious rodent control that keeps this persistent toxicant out of your pets' reach and out of the local food chain.

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(7)
  1. [1]
    Bell Laboratories — Contrac All-Weather Blox Safety Data Sheet

    Active ingredient confirmation (bromadiolone 0.005%), EPA Reg. No. 12455-79

    manufacturerverified 2026-07-13
  2. [2]
    EPA — Pesticide Product Label, Contrac All-Weather Blox (Reg. No. 12455-79)

    Registered label, aquatic/bird hazard statements

    epa_labelverified 2026-07-13
  3. [3]
    EPA — Restrictions on Rodenticide Products

    2011 consumer-sale restriction of second-generation anticoagulants

    govverified 2026-07-13
  4. [4]
    Merck Veterinary Manual — Anticoagulant Rodenticide Poisoning in Animals

    Mechanism, clinical signs, Vitamin K1 treatment

    veterinaryverified 2026-07-13
  5. [5]
    VCA Animal Hospitals — Anticoagulant Rodenticide Poisoning in Dogs

    Clinical signs and onset timeline

    veterinaryverified 2026-07-13
  6. [6]
    NPIC — Rodenticides Topic Fact Sheet

    Second-generation persistence, secondary-poisoning risk to wildlife

    npicverified 2026-07-13
  7. [7]
    ASPCA — Rodenticide and Your Pet: What You Need to Know

    Secondary-poisoning risk, emergency guidance

    aspcaverified 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 Rodent Control

Skip the Poison Guesswork

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