Livestock Disease Reporting in Massachusetts: Rules, Deadlines, and What to Expect

Livestock disease reporting in Massachusetts is not optional — it is a legal obligation backed by state statute and enforced by the Massachusetts Department of Agricultural Resources (MDAR). Whether you raise cattle, swine, poultry, sheep, goats, or horses, knowing which diseases trigger a mandatory report, who must file it, and how quickly you must act can make the difference between a contained outbreak and a statewide crisis.

This guide walks you through every stage of the reporting process in plain language, from the official list of reportable diseases to the consequences of staying silent when the law requires you to speak up.

Reportable Livestock Diseases in Massachusetts

Listed animal diseases must be reported to the State Veterinarian when detected or suspected in Massachusetts animals, and particular diseases must be reported to the MDAR Division of Animal Health when detected or suspected in animals living in or recently imported into Massachusetts. The reporting requirement also extends outward: the Division should also be notified if there has been exposure to animals that have recently been exported from Massachusetts.

Massachusetts maintains a tiered list of reportable diseases organized by urgency. The diseases below represent the major categories covered under the state’s program. Always verify the current official list at Mass.gov’s Reportable Animal Diseases page, as it is updated when new threats emerge.

Diseases marked with an asterisk on the official state list must also be reported to the Massachusetts Department of Public Health Epidemiology Program at 617-983-6800 within 24 hours of suspicion or diagnosis. These are primarily diseases with zoonotic potential — meaning they can spread from animals to people.

Practitioners should also report outbreaks of other diseases that seem to be progressing and which pose a threat to the animal population, including ringworm, rhinopneumonitis, and salmonella. The list is not exhaustive; emerging threats can be added at any time. For a deeper look at how bovine diseases factor into these obligations, see this overview of bovine disease and its implications for herd health.

Who Is Required to Report a Livestock Disease in Massachusetts

The reporting obligation in Massachusetts is broad by design. As required under M.G.L. c. 129, § 28, any veterinarian or local board of health with knowledge of the existence of a domestic animal affected with, or suspected to be affected with a contagious disease must report the disease to the Department of Agricultural Resources (DAR), Bureau of Animal Health.

The law does not stop with licensed veterinarians. Under Massachusetts General Laws Chapter 129, Section 28, the board of health of a town, any member or agent thereof, or any other person who has knowledge of or reason to suspect a contagious disease in livestock must notify the director. In practical terms, this means the following parties all carry a reporting duty:

• Licensed veterinarians (including accredited veterinarians)
• Livestock owners and farm operators
• Local boards of health and their agents
• Diagnostic laboratory personnel
• Livestock dealers, auction operators, and transporters
• Any person with knowledge or reasonable suspicion of a listed disease

DAR will immediately notify the Department of Public Health of any suspicion or occurrence of any such disease if it is potentially infectious to humans. This cross-agency notification chain means a single report from a farm owner can trigger a coordinated response across multiple state agencies.

At the federal level, an accredited veterinarian shall immediately report to both the Veterinary Official and the State Animal Health Official all diagnosed or suspected cases of a communicable animal disease for which APHIS has a control or eradication program, and all diagnosed or suspected cases of any animal disease not known to exist in the United States. Understanding the zoonotic disease risk profile of your animals is an important part of knowing when these dual reporting obligations apply.

Signs and Symptoms That Trigger a Report in Massachusetts

You do not need a confirmed laboratory diagnosis to be legally required to report. Suspicion based on clinical signs is sufficient. Knowing what to watch for in your animals is therefore a critical part of your compliance obligations.

The following clinical presentations should immediately raise your concern and prompt you to contact the State Veterinarian or MDAR Division of Animal Health:

• Sudden or unexplained death in one or more animals, particularly when multiple animals are affected in a short period
• Vesicular lesions (fluid-filled blisters) on the mouth, feet, teats, or snout — a hallmark sign of Foot-and-Mouth Disease and Vesicular Stomatitis
• Severe respiratory distress, including labored breathing, nasal discharge, and rapid-onset pneumonia in multiple animals
• Neurological signs such as tremors, circling, paralysis, or sudden behavioral changes — relevant for rabies, Eastern Equine Encephalitis, and scrapie
• Dramatic drops in milk production or reproductive failure across a herd with no obvious nutritional cause
• Rapid spread of illness through a flock or herd, especially following a recent animal purchase, show, or transport event
• Mass mortality in poultry, particularly chickens, turkeys, or ducks — a key indicator of Highly Pathogenic Avian Influenza

You should report any suspicious clinical or necropsy findings accompanied by a history of people or animals that have recently returned from a foreign country, and any disease of unknown etiology causing high mortality or morbidity.

For poultry operations specifically, sick or dead domestic poultry — including chickens, turkeys, gamebirds, and domestic ducks — should be reported to the Department of Agricultural Resources Division of Animal Health at 617-626-1795. Newcastle disease is one of the most critical poultry conditions to recognize early; learn more about it in this Newcastle disease overview. For wild bird concerns, bird disease resources can provide additional context on avian health risks.

How to Report a Livestock Disease in Massachusetts

Massachusetts provides clear, accessible reporting channels. The method you use depends on the urgency tier of the disease you suspect, but the primary contacts remain consistent across all categories.

The listed animal diseases must be reported to the State Veterinarian at 617-626-1791 or to the Division of Animal Health at 617-626-1795 when detected or suspected in animals that are in or have recently been exported from Massachusetts.

Here is a step-by-step breakdown of the reporting process:

1. Identify the urgency level. Determine whether the suspected disease falls into the immediate-report category (foreign animal diseases, HPAI, anthrax) or the 24- to 72-hour tier. When in doubt, treat it as urgent.
2. Call the State Veterinarian or Division of Animal Health immediately. For immediate-tier diseases, call 617-626-1791 (State Veterinarian) or 617-626-1795 (Division of Animal Health) before taking any other action. Do not wait for laboratory confirmation.
3. Provide key details during the call. Have the following information ready: producer or owner name, address, county, and phone number, as well as your own contact information including name, address, and relevant phone numbers. Also be prepared to describe the number of animals affected, species, clinical signs observed, and timeline of onset.
4. Confirm in writing or by email. For immediate-tier diseases, report immediately by telephone to the State Veterinarian and confirm in writing or via email. Written confirmation creates a documented record of your compliance.
5. Report to the Department of Public Health when required. Certain designated diseases must additionally be reported to the Massachusetts Department of Public Health Epidemiology Program at 617-983-6800 within 24 hours of suspicion or diagnosis. Check the official disease list for asterisked diseases that carry this dual-reporting requirement.
6. Report to USDA APHIS if federally required. For foreign animal diseases or federally regulated conditions, if you suspect a highly contagious foreign or reportable disease such as foot-and-mouth disease, classical swine fever, or highly pathogenic avian influenza, phone the Veterinary Official and the State Animal Health Official directly from the farm or premises. USDA’s after-hours FAD Hotline is available at 1-866-536-7593.

If you raise livestock in other states as well, it is worth understanding how reporting frameworks differ across borders. See how the process works in neighboring and comparable states: Florida, California, Michigan, and Illinois.

Reporting Deadlines and Timeframes in Massachusetts

Massachusetts uses a three-tier deadline structure that matches response urgency to disease severity. Understanding which tier applies to the disease you suspect is essential to staying in compliance.

For Tier 1 diseases, you must report immediately by telephone to the State Veterinarian and confirm in writing or via email. For Tier 2 diseases, report by telephone or via email within 24 hours. For Tier 3 diseases, report by telephone, in writing, or by email within 72 hours.

Notwithstanding requirements to report such cases to DAR, veterinarians must also report to the Department of Public Health within 24 hours any case of anthrax, plague, West Nile virus infection, or Eastern equine encephalitis virus infection diagnosed in an animal. These diseases carry a parallel 24-hour deadline to the DPH regardless of their tier classification for MDAR purposes.

At the federal level, notifiable diseases or conditions should be reported within 24 hours. Reporting under the National List of Reportable Animal Diseases does not supersede state requirements or notification processes for Foreign Animal Disease incidents or other regulated high-priority endemic disease reporting requirements. In other words, meeting the federal deadline does not substitute for meeting Massachusetts’s own deadlines — you must satisfy both.

For a comparison of how Colorado structures its own reporting timelines, see the livestock disease reporting in Colorado guide.

What Happens After You Report in Massachusetts

Filing a report sets a coordinated state response in motion. Understanding what to expect after you make that call helps you cooperate effectively and protects both your animals and your operation.

Step 1 — Initial assessment and follow-up contact. After you report, a MDAR Division of Animal Health official will contact you to gather additional information, assess the severity of the situation, and determine whether an on-site investigation is warranted.

Step 2 — On-site investigation. For suspected high-consequence diseases, inspectors may arrive at your premises quickly. Regular inspections ensure compliance, and MDAR evaluates structural integrity, cleanliness, and livestock health, helping facilities address issues and meet evolving care standards. During an investigation, officials may collect samples for laboratory testing, examine your records, and interview farm personnel.

Step 3 — Quarantine if warranted. If a disease is confirmed or strongly suspected, MDAR has authority to quarantine affected animals. Under Chapter 129, provisions exist for the destruction of animals affected with foot-and-mouth disease and the disinfection or destruction of buildings, as well as quarantine or destruction of animals affected with vesicular stomatitis or vesicular exanthema. Quarantine orders restrict movement of animals, equipment, and personnel on and off the premises.

Step 4 — Cross-agency notification. DAR will immediately notify the Department of Public Health of any suspicion or occurrence of any such disease if it is potentially infectious to humans. The Department will notify the local board of health of all such reports within 24 hours.

Step 5 — Federal notification when applicable. For diseases on the national reportable list, the National Animal Health Reporting System (NAHRS) is the only comprehensive reporting system for WOAH-reportable diseases in the United States, and Massachusetts state officials are responsible for escalating confirmed cases to USDA APHIS through that system.

Step 6 — Biosecurity guidance and ongoing monitoring. MDAR highlights biosecurity measures such as controlling access, maintaining clean feeding systems, and managing waste to protect public health and prevent contamination. You will typically receive written guidance on biosecurity protocols to follow during the investigation period.

Maintaining detailed records is not just good practice — it is a legal requirement. Massachusetts law mandates proper identification and record-keeping for livestock to support disease control and traceability, and under Massachusetts General Laws Chapter 129, Section 19, livestock owners must maintain accurate records of births, sales, and deaths. These records are essential for tracking disease outbreaks and ensuring public health.

Penalties for Failing to Report in Massachusetts

Massachusetts takes non-reporting seriously. The legal framework under Chapter 129 gives state officials broad authority to pursue enforcement action against individuals and operations that fail to meet their reporting obligations.

Non-compliance with livestock laws in Massachusetts can lead to significant legal consequences, and violations may result in fines ranging from hundreds to thousands of dollars per infraction under Chapter 129. Each day of continued non-compliance can be treated as a separate violation, meaning penalties can accumulate rapidly.

Beyond financial fines, the consequences of failing to report can include:

• Criminal charges. Severe breaches, particularly involving cruelty, can lead to criminal charges with potential imprisonment or fines under Chapter 272, Section 77. While most reporting failures are handled as civil violations, egregious cases involving deliberate concealment of a dangerous disease can escalate to criminal prosecution.
• Quarantine and operational restrictions. MDAR can impose quarantine orders on your premises, halting all movement of animals, products, and equipment. This can effectively shut down your operation for the duration of an investigation.
• Loss of licenses and permits. Failure to secure necessary licenses or comply with regulations can result in fines or operational shutdowns, emphasizing the importance of compliance. Livestock dealers, auction operators, and equine businesses operating under MDAR-issued licenses face revocation for regulatory violations.
• Liability for spread of disease. If your failure to report allows a disease to spread to neighboring farms, you may face civil liability claims from affected producers in addition to state enforcement action.

Veterinarians face a particularly high standard. The vast majority of reporting of notifiable diseases occurs through veterinarians and diagnostic laboratories; however, due to the serious nature of notifiable diseases and their possible negative impact on U.S. animal agriculture and trade, any animal health professional who has knowledge or suspicion of these diseases is required to report. A licensed veterinarian who knowingly withholds a reportable disease diagnosis risks professional discipline in addition to statutory penalties.

The bottom line is straightforward: the cost of reporting is a phone call. The cost of not reporting can be your operation, your license, and potentially your freedom. If you are ever uncertain whether a condition is reportable, the correct action is always to call MDAR and ask — that call itself demonstrates good faith and protects you legally.

For related animal health topics that may intersect with your livestock operation, explore resources on Lyme disease — a tick-borne illness prevalent in Massachusetts that affects multiple species — and review tick-borne disease prevention strategies applicable across your farm environment.