Cattle Trailer DOT Requirements, CVI Certificates, and Livestock Hauling Laws: What Texas Ranchers Need to Know

What You Need to Know Before You Haul Cattle in Texas

Most ranchers know the basics: get a health certificate, don't overload the trailer, and keep your truck legal. But the details of cattle trailer compliance — especially where federal DOT rules, Texas state rules, and USDA animal health requirements overlap — can trip you up if you haven't done a full review lately.

This guide covers the practical compliance requirements for hauling cattle in Texas and across state lines. It's written for working ranchers, not lawyers — so we'll skip the regulatory cross-references and focus on what you actually need to have, know, and do.

Note: this is educational information. For your specific operation, consult a licensed veterinarian and the Texas Animal Health Commission (TAHC). Rules change.

The Two Separate Frameworks: Vehicle + Animal

Livestock hauling compliance lives in two separate regulatory worlds:

1. Vehicle/transportation law — DOT federal rules, Texas TxDOT requirements, driver licensing, weight limits, inspection standards
2. Animal health law — USDA/APHIS regulations, TAHC requirements, CVI certificates, brand inspection, tuberculosis and brucellosis testing

You have to be right on both. A DOT-compliant rig hauling cattle without a valid CVI is still a violation. Let's work through each.

Vehicle and DOT Requirements

When Federal DOT Rules Apply

Federal Motor Carrier Safety Administration (FMCSA) regulations kick in based on Gross Vehicle Weight Rating (GVWR) and the nature of commerce. Here are the thresholds that matter for most ranching operations:

• GVWR over 10,001 lbs: Basic DOT number and registration may be required if operating in interstate commerce
• GVWR over 26,001 lbs: Commercial Driver's License (CDL) required for interstate commerce; some exemptions apply
• Combination vehicle (truck + trailer) over 26,001 lbs GCWR: CDL Class A required for interstate, subject to exemptions

The agricultural exemption is significant here. Federal rules (49 CFR 395.1) exempt drivers operating within a 150-air-mile radius of their farm from most hours-of-service requirements when transporting agricultural commodities (including livestock) to or from a farm. This exemption is widely used by Texas ranchers and doesn't require special paperwork — but it has limits.

The Agricultural Exemption — Know Its Edges

The 150-mile ag exemption covers hours-of-service (HOS) requirements, not CDL thresholds or equipment inspection rules. Specifically:

• It does NOT exempt you from CDL requirements if your combination weight triggers them
• It does NOT exempt you from roadside inspection or equipment safety standards
• It applies within 150 air miles of the farm — not just 150 miles on the odometer from home
• It covers transporting livestock to/from a farm, sale barn, or processing facility

For operations that regularly haul cattle beyond 150 miles — say, from the Gulf Coast up to the Panhandle — you need to treat this as a commercial operation with full HOS compliance.

CDL Requirements in Texas

Texas follows federal CDL thresholds for interstate commerce but has some intrastate-only provisions. Key thresholds:

• Class A CDL: Combination vehicles with GCWR over 26,001 lbs where the towed unit is over 10,000 lbs GVWR
• Class B CDL: Single vehicle over 26,001 lbs (rare for livestock hauling)

Many ranchers hauling large gooseneck trailers with heavy trucks fall into Class A territory by weight. The agricultural exemption under Texas Transportation Code may exclude purely intrastate operations meeting certain criteria, but this area has evolved — consult TxDMV or a transportation attorney if you're near the thresholds.

Trailer Weight Limits and Permits

Texas roads enforce weight limits by axle group and gross weight. Standard limits:

• Single axle: 20,000 lbs
• Tandem axle: 34,000 lbs
• Gross vehicle weight: 80,000 lbs (on most highways)

A loaded gooseneck cattle trailer can hit these limits quickly depending on cattle weight and trailer size. A 32' gooseneck loaded with 28–30 head of 1,200-lb steers is carrying 33,600–36,000 lbs of cattle alone, plus trailer weight. Know your axle weights before you load.

Overweight permits are available through TxDMV for loads exceeding standard limits. Livestock haulers sometimes qualify for higher weight allowances; check TxDMV's permit office for current rules.

Animal Health Requirements: CVI and Brand Inspection

Certificate of Veterinary Inspection (CVI)

A Certificate of Veterinary Inspection (CVI) — sometimes called a health certificate — is a document issued by a licensed accredited veterinarian certifying that the animals being transported have been inspected and appear healthy and meet the import/export requirements of the destination state or country.

When you need a CVI in Texas:

• Any interstate movement of cattle — required by virtually every state for incoming cattle. This is non-negotiable.
• Some intrastate movements — TAHC may require CVI for cattle moving to sale or slaughter under certain circumstances
• Movement from a quarantined area — if there's an active disease control zone, CVI requirements may be stricter

A standard CVI for cattle typically requires:

• Veterinarian's examination of the animals within 30 days of movement (interstate requirements vary by destination state — some require within 10 days)
• Animal identification: USDA official ear tags (840 tags) are standard; brand can supplement
• Documentation of any required testing: TB and brucellosis testing requirements depend on origin state, destination state, and animal class

The CVI must accompany the shipment. Keep it in the cab, accessible for inspection at weigh stations or roadside checks.

Texas Animal Health Commission (TAHC) Requirements

TAHC regulates movement of livestock within Texas. Key requirements for cattle:

• Brand inspection: Required for certain movements in Texas, especially to sale barns and for out-of-state shipments. The Texas and Southwestern Cattle Raisers Association (TSCRA) operates brand inspection for most of Texas.
• Official ID: USDA 840 ear tags are required for most interstate cattle movement. Texas brand is not sufficient alone for most federal purposes.
• Tuberculosis testing: Texas is accredited TB-free, so requirements depend on where cattle originate. Cattle from certain other states require negative TB tests before entering Texas.
• Brucellosis: Similar to TB — testing requirements based on origin, destination, and class of animal (heifers over 18 months face different rules than steers or cows).

Destination State Requirements

Every state has its own import requirements. Before hauling cattle to Louisiana, Oklahoma, New Mexico, or anywhere else, check that state's department of agriculture requirements. Common requirements:

• CVI issued within specific window (7–30 days)
• Negative TB and brucellosis tests within specific timeframes
• Official ID on all animals
• Some states require specific accredited vet endorsement

The USDA APHIS maintains state-by-state import requirements. Your accredited vet should be familiar with requirements for the states you routinely haul to.

Trailer Condition and Animal Welfare

The Twenty-Eight Hour Law (federal) requires that animals being transported by vehicle for commercial purposes be unloaded for water, food, and rest after 28 consecutive hours of transport. For most ranch-scale cattle hauling this isn't an issue, but commercial cattle haulers need to plan for it.

Texas law and USDA guidelines also prohibit transporting animals in trailers that are structurally unsafe, too small to allow normal standing position, or with flooring that creates injury risk. This is another reason trailer construction quality matters:

• Proper floor cleating to prevent slipping during loading and transport
• Rounded interior corners to reduce bruising and injury
• Working gate latches that secure fully
• Adequate ventilation — especially important in Texas summers
• Solid structural integrity — a trailer that flexes or rattles under load stresses the cattle more and creates injury risk

A Star Manufacturing cattle trailer built to our standard spec — 5/16" heavy angle frame, full hot dip galvanized finish — meets these requirements with margin. The heavier frame means less flex. The galvanized floor components stay structurally sound longer than painted alternatives that rust from underneath.

Pre-Trip Inspection Checklist

Before every load, walk the trailer:

• Floor condition — no rot, no soft spots, all boards/planks secure
• All gates functional, latches engaging fully
• Lights: running, brake, turn signals all working
• Tires: pressure and tread (check duals for hidden flats)
• Coupling: gooseneck ball seated and locked, safety chains attached
• Brakes: trailer brakes functional and adjusted
• Ventilation: no blocked vents, adequate airflow path

If you're keeping a formal inspection log for commercial operations, document it. A FMCSA inspector at a weigh station may ask for it.

Resources

• Texas Animal Health Commission (TAHC): tahc.texas.gov | (512) 719-0700
• Texas and Southwestern Cattle Raisers Association (TSCRA): tscra.org | for brand inspection
• TxDMV Commercial Vehicle Operations: txdmv.gov
• FMCSA Agricultural Exemptions: fmcsa.dot.gov
• USDA APHIS State Import Requirements: aphis.usda.gov

Getting the Right Trailer for the Work

Compliance is easier when your equipment is right. A well-built trailer passes inspection, hauls safely, and doesn't require you to explain deficiencies to a roadside inspector.

Star Manufacturing builds cattle trailers from 14' to 40' in Wharton, TX. Every trailer features a 5/16" heavy angle frame, full hot dip galvanized finish, and laser cut components. Price your configuration at our online quote builder or call us at (979) 532-1486.

For more practical ranching guides, see our posts on choosing the right trailer size, truck and towing requirements, and trailer maintenance checklists.