Can I Give My Cat household 3%?

No
Same, saline only.
Source: Veterinary Partner (VIN)
Already ingested? Pet Poison Helpline 855-764-7661

Skip it or ask a vet first if

all wound care

The safe habit

Confirm any medication decision with your veterinarian, who knows your cat's health history and other medications. VetDose shows published reference data, not prescriptions.