There are both state and federal regulations regarding shipment of livestock and other animals across state lines. Most regulations are related to efforts to prevent, control, or eradicate animal diseases. Some are to prevent livestock theft.
As the animal owner, you are responsible for being aware of, and complying with, the regulations when you take your animal(s) into another state. Your veterinarian can help you with this process.
There are special requirements owners should be aware of before bringing cattle into Oregon for any reason.