Appleton, WI Animal Ordinances: Mandatory Spay/Neuter (2026)

Under Municipal Code Sec. 3-132(f), once an animal has been designated dangerous under Sec. 3-134, the owner or caretaker has thirty (30) days to provide the Health Officer with written proof from a licensed veterinarian that the animal has been spayed or neutered. This sits alongside the rest of Sec. 3-132's dangerous-animal package: secure pen and confinement standards in subsections (b) and (c), warning signs at least two inches tall posted at every entrance under subsection (e), and a liability insurance certificate of at least $1,000,000 under subsection (g).

The Board of Health may waive any requirement in subsections (a) through (g), including the spay/neuter mandate, if it finds the requirement inappropriate for a particular animal under subsection (h). Owners must also notify the Police Department within 24 hours of an escape, attack, or death involving the animal, and give three days' written notice before selling or transferring a dangerous animal to a new owner. If the owner cannot or will not comply with the sterilization or other Sec. 3-132 requirements, subsection (j) allows the animal to be humanely euthanized by an animal shelter, the humane society, or a licensed veterinarian instead.

Separately, Sec. 3-69 offers a discounted annual dog or cat license fee to any owner who voluntarily provides veterinary proof of sterilization, but that discount program is optional and applies to every licensed pet, not just those designated dangerous.