Rosie's Law — HB 4540 Animal Custody Reform
Requiring Illinois courts to consider caregiving history, emotional bonds, and animal well-being in companion-animal custody disputes — for all residents, regardless of marital status.
HB 4540 — Signed Into Law
HB 4540 — the Companion Animal Custody Equity Act — was signed into law by Governor JB Pritzker on July 24, 2026, and takes effect January 1, 2027. Illinois becomes roughly the 10th state to adopt similar provisions, joining Alaska, California, Colorado, New Hampshire, Maine, New York, Delaware, Rhode Island, and D.C. Filed by Rep. Barbara Hernandez. Chief Senate Sponsor: Sen. Linda Holmes, who framed the law as giving courts 'guidance to consider the best outcome for the animal's consistent caregiving and comfort.'
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How Rosie's story exposed a legal gap
When Rosie, a senior dog, became the subject of a custody dispute in Illinois, the courts treated her as property — not as a living being with a primary caretaker. Judges couldn't weigh her well-being or years of care simply because the couple was not married. Rosie's Law, the Companion Animal Custody Equity (CACE) Act changes that. How did a small court case inspire the creation of the CACE Act?
Illinois leads the nation in animal law reform
Rosie's Law, formally HB 4540, was signed by Governor JB Pritzker on July 24, 2026, and takes effect January 1, 2027. The law empowers Illinois courts to issue temporary custody and visitation orders, prioritizing caregiving history and animal well-being — applicable to anyone in a custody dispute, not just divorcing couples. The Animal Legal Defense Fund has ranked Illinois #1 in the nation for animal law for 10 consecutive years.
The CACE Act (HB4540) modernizes animal custody law
Allows Illinois courts to consider caregiving history and animal welfare in possession disputes.
Rosie is the heart behind Rosie's law.
Rosie is a senior Puggle whose custody was awarded without consideration of her established caregiving history — a direct consequence of Illinois law classifying companion animals as personal property. Her case is the foundation of this initiative. Learn more at JusticeForRosie.org.
Led by a Psychologist and Animal Justice Advocate
After losing custody of her companion animal in a proceeding that treated her dog as property, Dr. Tameer Siddiqui drafted the original framework and naming of the Companion Animal Custody Equity Act. Her work now continues in collaboration with legislators and advocates working to advance recognition of the human–animal bond in Illinois law.
Centralized materials for lawmakers
Executive summaries, full bill text, amendments, and media resources all in one place.
Growing bipartisan backing
Legislators, advocates, and animal welfare organizations united behind modernizing companion-animal law.
Signed into law — takes effect January 1, 2027
Governor JB Pritzker signed HB4540 on July 24, 2026. Illinois is roughly the 10th state to enact companion-animal custody reform.
HB4540 Signed Into Law — Takes Effect January 1, 2027
Rosie's Law (HB4540) — the Companion Animal Custody Equity Act — was signed by Governor JB Pritzker on July 24, 2026. Illinois is now roughly the 10th state to enact similar companion-animal custody provisions. Chief Senate Sponsor: Sen. Linda Holmes, who stated courts need 'guidance to consider the best outcome for the animal's consistent caregiving and comfort.' The law allows courts to issue temporary custody and visitation orders and applies to anyone in a possession dispute — not just divorcing couples.
Modernized Legal Framework
HB4540 replaces outdated property-based custody rules with standards that recognize animals as sentient beings deserving judicial consideration.
Caregiving History Standard
Courts can evaluate who provided primary care, training, and daily support for the animal in custody disputes.
Animal Well-Being Consideration
Courts can weigh the animal's physical, behavioral, and emotional needs when determining custody arrangements.
Comprehensive Court Guidance
The statute provides specific factors for judges to apply consistently across all companion-animal possession disputes throughout Illinois.
The Gap
The CACE Act was informed by a real companion-animal custody dispute adjudicated in Cook County, where existing property law rendered the animal's wellbeing, established bonds, and caregiving history legally irrelevant. Because the co-caregivers were unmarried, the court lacked the statutory authority to consider any factor beyond ownership — exposing a critical gap in Illinois companion-animal law.
Evidence-Based Standards
The statute draws on animal behavior science and custody law research to create fair, predictable outcomes in animal possession cases.
Voices Behind Rosie's Law
Lawmakers, animal welfare advocates, and legal experts support HB4540's modernization of companion-animal custody law.
HB4540 fills a critical gap in Illinois law. Courts deserve the framework to prioritize animal welfare in custody disputes, not just property claims.
Representative
Illinois State Legislature
This bill reflects what animal welfare organizations have advocated for years. Rosie's Law puts the animal's well-being at the center of the law.
Volunteer
Illinois Animal Welfare Coalition
As a family law attorney, I've seen too many cases where caregiving history was ignored. HB4540 gives courts the tools they need to make fair decisions.
Family Law Attorney
Chicago Bar Association
Tameer Siddiqui's work on this initiative is exactly what evidence-based policy looks like. The legal framework is sound and necessary.
Professor
Loyola University School of Law
Illinois pet owners deserve a law that recognizes their role in their animals' lives. HB4540 does that with clarity and compassion.
Liason
Illinois Pet Owners Alliance
This legislation is a model for other states. Chicago is leading the way in modernizing how courts handle companion-animal disputes.
Coordinator
National Animal Law Center
Celebrate the signing of HB4540
Rosie's Law was signed on July 24, 2026. Join lawmakers, advocates, and animal welfare partners in celebrating this historic step forward for Illinois companion-animal custody law.
HB4540 signed into law — takes effect January 1, 2027
Rosie's Law was signed by Governor JB Pritzker on July 24, 2026, marking a historic milestone for animal welfare policy in Illinois — a state ranked #1 nationally for animal law by the Animal Legal Defense Fund for 10 years running.
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Legislative supporters
State representatives and senators backing HB4540 to modernize companion-animal custody law.
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Media outlets covering initiative
Regional and statewide publications reporting on Rosie's Law and its impact on animal welfare policy.
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Advocacy organizations aligned
Animal welfare groups, legal experts, and policy organizations supporting the modernization effort.
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Official legislative hub
Centralized platform providing lawmakers, staff, and media with comprehensive HB4540 materials and resources.