Importing Cattle Into Wyoming: State Entry Rules, CVI Requirements, and Who to Call

Moving cattle across state lines into Wyoming isn’t as simple as loading a trailer and heading out. The state enforces strict entry requirements designed to protect its livestock industry from disease outbreaks, and failing to comply can mean turned-away shipments, quarantined animals, and significant financial losses.

Whether you’re bringing in a single breeding bull or an entire cow-calf operation, Wyoming requires advance planning, proper documentation, and in some cases, specific disease testing before your cattle ever cross the border. This guide walks you through every official requirement so you arrive prepared, not scrambling at a weigh station.

Wyoming’s Entry Requirements for Incoming Cattle

Wyoming is a major cattle-producing state, and its animal health regulations reflect that priority. Before you ship any cattle into Wyoming from another state, you need to understand the baseline entry requirements that apply to virtually all incoming livestock.

All cattle entering Wyoming must be accompanied by a valid Certificate of Veterinary Inspection (CVI), also called a health certificate, issued by a licensed and accredited veterinarian in the state of origin. The CVI must be issued within 30 days of the cattle’s arrival in Wyoming for most classes of cattle. Without this document in hand, your shipment can be refused entry at the border or at inspection points.

Wyoming also requires that all cattle be officially identified before crossing state lines. This means individual animals must carry approved official eartags, and the tag numbers must be recorded on the accompanying CVI. Cattle moving for feeding or slaughter purposes may have slightly different identification thresholds, but breeding and dairy animals face the strictest identification standards.

Important Note: Wyoming participates in the USDA’s National Animal Identification framework. Official eartags must meet USDA-approved standards, including RFID (840-prefix) eartags for most classes of cattle. Confirm tag compliance with your accredited veterinarian before loading day.

In addition to the CVI and official ID requirements, Wyoming may require an import permit for certain classes of cattle or cattle originating from specific states or regions. Permit requirements can change based on disease status designations, so contacting the Wyoming Livestock Board (WLSB) before shipment is always the safest first step. You can learn more about how Wyoming manages its broader livestock and wildlife regulations by reviewing cattle-related resources that cover animal management across the country.

Official Identification Requirements for Interstate Cattle Movement

Official identification is one of the most critical components of any interstate cattle movement, and Wyoming enforces it consistently. Understanding exactly what qualifies as official ID—and what doesn’t—will save you from compliance problems on shipping day.

For cattle moving interstate, the USDA requires official eartags that meet the National Uniform Eartagging System (NUES) standards or RFID eartags with the 840-country code prefix. These are the gold standard for traceability, allowing state and federal animal health officials to track individual animals back to their herd of origin if a disease event occurs.

• 840 RFID eartags – The most widely accepted form of official ID for interstate movement; required for most breeding cattle
• Bangs vaccination tags – Required on all eligible female cattle vaccinated for brucellosis; must be present alongside official eartags
• Brand inspection certificates – Required for cattle with registered brands moving through or into Wyoming; issued by the Wyoming Livestock Board
• Back tags or lot tags – Acceptable for slaughter cattle moving directly to a federally inspected facility, but not a substitute for official ID on breeding or dairy animals

All official tag numbers must be individually listed on the CVI. If a tag is missing or illegible at the time of inspection, the animal may be held until proper identification can be established. This is especially important when moving different cattle breeds that may have varying tagging histories depending on their operation of origin.

Pro Tip: Apply official eartags at least a few days before your scheduled ship date. Last-minute tagging increases the risk of tag loss during loading, which can create documentation mismatches on your CVI.

Wyoming also enforces brand inspection laws for cattle entering, leaving, or moving through the state. If your cattle carry a registered brand, you’ll need a brand inspection certificate issued by a Wyoming Livestock Board brand inspector or an equivalent inspector from the state of origin. Brand inspection is a legal requirement in Wyoming, not a formality—violations can result in animals being held and fines assessed against the shipper.

Certificate of Veterinary Inspection (CVI) Requirements for Wyoming

The Certificate of Veterinary Inspection is the single most important document in any interstate cattle shipment. Wyoming’s requirements for CVIs are specific, and a certificate that doesn’t meet state standards won’t be accepted at inspection points regardless of how far you’ve traveled.

Your CVI must be issued by a veterinarian who is both licensed in the state of origin and accredited by the USDA under the National Veterinary Accreditation Program (NVAP). A license alone is not sufficient—USDA accreditation is mandatory for interstate health certificates. If your regular vet isn’t USDA-accredited, you’ll need to find one who is before your ship date.

The following information must appear on a valid CVI for Wyoming-bound cattle:

1. Full name, address, and contact information of the consignor (seller/shipper)
2. Full name, address, and contact information of the consignee (buyer/receiver)
3. Destination address in Wyoming where cattle will be delivered
4. Species, number of head, breed, sex, and approximate age of each animal
5. Official identification numbers (eartag numbers) for each animal
6. Statement of the purpose of movement (e.g., breeding, feeding, slaughter)
7. Results of all required disease tests, or a statement that tests were not required
8. Veterinarian’s signature, USDA accreditation number, and date of inspection

The CVI is valid for 30 days from the date of issuance for most cattle classes entering Wyoming. For exhibition cattle, the validity window may differ. Never rely on a CVI that was issued for a previous shipment or one that has been altered in any way—altered health certificates are a federal violation.

Common Mistake: Many producers assume the CVI from a recent sale barn purchase is sufficient for interstate movement. Sale barn health certificates are often issued for in-state movement only. Always verify with your veterinarian that the CVI explicitly covers interstate movement to Wyoming.

If you’re transporting cattle through Wyoming to another state, a CVI is still required for the animals to pass through. Wyoming does not exempt transit shipments from health certificate requirements. Keep the original CVI with the shipment at all times—photocopies are not accepted at official inspection points.

Disease Testing Requirements Before Entering Wyoming

Disease testing is where Wyoming’s entry requirements get the most detailed, and where producers most often run into compliance problems. The specific tests required depend on the class of cattle, their state of origin, and the designated disease status of the area they’re coming from.

Brucellosis Testing

Brucellosis remains one of Wyoming’s most closely monitored diseases due to the state’s proximity to the Greater Yellowstone Area (GYA), where free-ranging bison and elk carry the disease. Wyoming is a Class Free state for brucellosis, and it intends to stay that way.

Female cattle 18 months of age and older originating from a USDA-designated Brucellosis Class A state or area must have a negative brucellosis test within 30 days prior to entry. Cattle originating from Class Free states and not passing through a Class A area are generally exempt from this testing requirement, but you must confirm current state classifications with the WLSB before assuming exemption applies.

Cattle entering Wyoming from states that border the Greater Yellowstone Area Designated Surveillance Area (DSA) may face additional testing or permit requirements. The DSA includes parts of Wyoming, Montana, and Idaho, and cattle moving within or out of this zone are subject to heightened scrutiny.

Key Insight: Wyoming’s brucellosis regulations are directly tied to the ongoing wildlife-livestock interface issue in the Greater Yellowstone ecosystem. Requirements can change based on annual surveillance data, so never assume last year’s rules still apply.

Trichomoniasis Testing

Wyoming requires that all sexually intact male cattle (bulls) 12 months of age and older originating from states that do not have an equivalent trichomoniasis control program must test negative for Tritrichomonas foetus within 30 days prior to entry. Trichomoniasis is a venereal disease that causes significant reproductive losses in beef herds, and Wyoming takes its prevention seriously.

The test must be performed by a USDA-accredited veterinarian using an approved culture or PCR method. A single negative test is required, but bulls that have been exposed to infected females may require multiple tests to confirm negative status. Test results must be recorded on the CVI.

Tuberculosis (TB) Testing

Tuberculosis testing requirements for cattle entering Wyoming depend on the TB status of the state of origin. Cattle from states designated as TB Accredited Free are generally not required to test before entry. However, cattle from states with Modified Accredited, Modified Accredited Advanced, or Accreditation Preparatory designations must meet specific testing requirements before crossing into Wyoming.

Cattle from any state with an active TB outbreak or under a TB control program may require individual animal testing within 60 days prior to entry. Contact the WLSB directly to confirm whether your state of origin currently triggers TB testing requirements, as USDA TB status designations are updated regularly.

Special Rules for Dairy, Breeding, and Slaughter Cattle in Wyoming

Not all cattle are treated equally under Wyoming’s entry rules. The state applies different—and in many cases stricter—requirements based on the intended use of the animals. Understanding which category your cattle fall into before you start paperwork will prevent costly surprises.

Breeding Cattle

Breeding cattle face the most comprehensive entry requirements of any class. This includes all sexually intact bulls and females intended for use in a breeding program, whether beef or dairy. In addition to a valid CVI and official ID, breeding cattle must meet all applicable disease testing requirements for brucellosis, trichomoniasis (bulls), and tuberculosis based on their origin state’s status.

Breeding cattle also require individual animal identification on the CVI—lot-level descriptions are not acceptable. Each animal must be individually listed with its official eartag number, breed, sex, and age. If you’re importing registered purebred cattle, bring registration papers as supplemental documentation, though they do not replace the CVI.

Producers bringing in new breeding stock should also be aware of Wyoming’s brand inspection requirements. Any cattle with a registered brand entering Wyoming must have a brand inspection certificate that clears the brand as belonging to the shipper. This protects both buyers and sellers and is enforced at Wyoming’s official inspection points. Exploring different cattle breeds commonly used for breeding programs can help you anticipate what documentation previous owners may have maintained.

Dairy Cattle

Dairy cattle entering Wyoming must meet all standard CVI and official ID requirements, plus any applicable disease testing. Wyoming also requires that dairy cattle originating from herds not enrolled in an official state or federal milk quality program provide documentation of herd health status from the state veterinarian of origin.

Dairy bulls moving interstate for breeding purposes are subject to the same trichomoniasis testing requirements as beef bulls. Don’t assume dairy bulls are exempt—Wyoming’s trichomoniasis rules apply to all sexually intact males regardless of breed or intended use.

Pro Tip: If you’re importing dairy heifers for a new operation in Wyoming, contact the Wyoming Department of Agriculture’s Animal Health Division early in the planning process. They can help you identify any herd-level certifications that may simplify your entry paperwork.

Slaughter Cattle

Cattle moving directly to a federally inspected slaughter facility in Wyoming have the most streamlined entry requirements. A CVI is still required, but disease testing requirements are generally waived for animals moving directly to slaughter under official supervision. Lot-level identification using back tags is acceptable in most cases, though official eartags are still preferred.

The key word here is “directly.” Slaughter cattle that make any stop at a non-slaughter facility—including a sale barn, feedlot, or pasture—lose their slaughter-only status and become subject to the full entry requirements for their class. If your route includes any intermediate stops in Wyoming, plan your documentation accordingly.

How to Contact Wyoming’s Animal Health Officials Before You Ship

No guide—including this one—replaces a direct conversation with Wyoming’s animal health officials before your shipment leaves the origin state. Requirements change based on disease surveillance data, seasonal outbreaks, and updated federal designations. A five-minute phone call before loading day can prevent a full day’s delay at the border.

Wyoming Livestock Board (WLSB)

The Wyoming Livestock Board is your primary point of contact for all cattle entry questions. The WLSB oversees brand inspection, import permits, and enforcement of Wyoming’s livestock entry laws. They can confirm current permit requirements, verify whether your state of origin triggers any special conditions, and issue import permits when required.

• Phone: (307) 777-7515
• Website: wlsb.wyo.gov
• Address: 2020 Carey Avenue, Cheyenne, WY 82002

Wyoming Department of Agriculture – Animal Health Division

For questions specifically related to disease testing requirements, CVI standards, and the state veterinarian’s current guidance on brucellosis or tuberculosis entry rules, contact the Wyoming Department of Agriculture’s Animal Health Division.

• Phone: (307) 777-6443
• Website: agriculture.wyo.gov/animal-health

USDA APHIS Veterinary Services

For federal-level questions about official eartag standards, USDA accreditation for your veterinarian, or interstate movement regulations that span multiple states, the USDA APHIS Veterinary Services office is the authoritative federal resource. They also maintain the current brucellosis and tuberculosis state status designations that determine your testing obligations.

Your USDA-Accredited Veterinarian

Your accredited vet in the state of origin is a critical partner in this process. They issue the CVI, conduct required disease tests, and are legally responsible for the accuracy of the health certificate. Give your vet as much advance notice as possible—at least two weeks before your planned ship date—so they have time to schedule testing, process results, and complete paperwork without rushing.

Key Insight: If you’re new to moving cattle interstate, ask your accredited vet to walk you through the CVI line by line before they sign it. Errors or omissions on a health certificate are one of the most common reasons shipments are delayed or refused at state lines.

Interstate Livestock Movement Resources

Several tools can help you cross-reference requirements before calling officials. The Interstate Livestock database aggregates state-by-state entry requirements and is widely used by livestock producers and veterinarians. While it’s a useful starting point, always verify current requirements directly with Wyoming officials, as database updates may lag behind regulatory changes.

Understanding Wyoming’s animal regulations goes beyond cattle movement. The state manages a broad range of wildlife and livestock interactions that affect ranching operations statewide, from native snake species that share grazing land to predator pressure from wildlife that intersects with livestock areas. Staying informed about Wyoming’s broader animal management landscape helps you operate more effectively once your cattle arrive.

Moving cattle into Wyoming is a process that rewards preparation. Confirm your entry requirements with the WLSB at least two weeks out, schedule your vet inspection early, verify your official ID tags are compliant, and keep all documentation with the shipment from origin to destination. Do those things, and your cattle will cross the Wyoming state line without a hitch.