Is Source Kill Large Roach Bait by Combat Safe for Pets?

Garage/basement placement plus a chewable station is the real-world risk

Dogs are the pets most likely to chew a bait station's plastic housing open. "Large roach" targeting often means placement in a garage or basement where dogs may roam unsupervised more than in a kitchen. Fipronil can cause neurologic signs at sufficient exposure; hydramethylnon is comparatively lower-toxicity but still warrants a vet call if a station is breached.

▸Merck Veterinary Manual — fipronil toxicosis; Amdro manufacturer statement on hydramethylnon toxicity

Ingestion of the bait matrix is the concern

Cats are less likely to chew plastic open than dogs, but a batted-around or cracked station in a garage or basement still risks ingestion of whichever active is inside.

▸Merck Veterinary Manual — fipronil toxicosis

Keep entirely out of reach regardless of which active is inside

Pet rodents and rabbits are small-bodied and inquisitive; a station within reach is an unacceptable risk whether the label lists fipronil or hydramethylnon.

▸Merck Veterinary Manual — fipronil toxicosis

Keep free-flying birds away from stations

If the fipronil SKU, NPIC notes high acute-oral toxicity to some birds; the manufacturer characterizes hydramethylnon as lower bird toxicity, but a pet bird shouldn't have access to either.

▸NPIC — Fipronil General Fact Sheet

Never rinse stations or dispose of bait near water

Fipronil is highly to very highly toxic to fish and aquatic invertebrates. Treat both possible SKUs the same way here and never wash out or discard a station near an aquarium, drain, or waterway.

▸NPIC — Fipronil General Fact Sheet