The photographs should be clear and current and show your horse from all four sides to highlight his identifying marks. Have your horse permanently identified. You can have your horse permanently identified by microchip or freeze brand. If you have your horse microchipped, be sure to register the microchip with a national registry. Don't leave a halter on your horse.
Halters make it easier for thieves to catch horses.
Also, do not leave halters hanging near gates where thieves might enter. Lock gates and barn doors. Locked gates and barn doors often will deter a thief, but be certain that they do not create a fire hazard. Erect sturdy fencing around your property. Wire fencing is easily cut by thieves.