Don't think I've seen or heard of any court cases involving brands in my lifetime but there could have been some. Here are Texas laws which are probably similar to everyone elses.
Texas Brand Laws
Texas Cattle Brands are controlled by the Texas Brand Laws. First we'll give you a recap of those regulations and then show excepts of the actual code. For official information about the Brand Laws for Texas and the Cattle Brands that are governed by them, consult the state's web site.
Branding Recap:
Branding Required"
Branding or marking is required on cattle, hogs, sheep, or goats. Voluntary on horses. Cattle marked on or before 12 months old. Others on or before 6 months old.
Methods Allowed:
Specified as "fire or electric heat brand, freeze brand, acid brand, or hoof brand; earmark, tattoo or electronic device.
Characters Allowed:
Letters, numbers, or figures
Size Required:
No specified size requirements
Brand Location:
Specified by owner as part of the brand registration.
State Agency:
Brands registered with the county court and unlike most states can be duplicated by others owners for other counties. Brand owners may register their brand in as many counties as they desire. Brands are the responsiblity of the Texas Department of Agriculture.
Brand Book:
Brand registrys are maintained by the County Clerk of each Texas county.
Reserved Brands:
Registration Fee:
$5.00 per brand to register for a Ten year period.
Sale or Transfer:
Registered brands may be sold or transferred by the owner.
Penalties:
Criminal and financial penalties are prescribed for violations of the regulations including using someone else's brand and using a non-registered brand.
Proof of Ownership:
Brand ownership provides prima facia evidence of ownership of branded livestock.