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

The mandate sits inside Milwaukee's dangerous-animal ordinance, not a general pet law. Under Milwaukee Code of Ordinances Chapter 78, the commissioner may designate an animal dangerous based on documented incidents of aggressive behavior or conduct creating a reasonable public-safety concern. Once that designation is made, § 78-23-6, headed 'Spay and Neuter Requirement,' gives the owner or caretaker 30 days to have the animal spayed or neutered and to provide written proof from a licensed veterinarian. The requirement runs alongside the chapter's other dangerous-animal conditions imposed on the same 30-day clock: leash-and-muzzle rules, secure confinement, warning signage, and a required behavioral management plan.