There are a few important things to consider when building a kennel for your German Shepherd Dog:

1. Size: Make sure the kennel is large enough for your dog to stand up, turn around, and lie down comfortably. A general rule of thumb is to allow at least 100 square feet of space per dog.
2. Material: Choose a durable material for the kennel, such as concrete or heavy-duty plastic. This will ensure that the kennel can withstand the wear and tear of daily use and the elements.
3. Shelter: Provide your dog with a shelter to protect them from the sun, wind, and rain. This can be a simple tarp or a more permanent structure, such as a doghouse.
4. Fencing: Make sure the fencing around the kennel is high enough to prevent your dog from jumping over it, and bury it at least a foot underground to prevent digging.
5. Drainage: Consider installing drainage in the kennel to prevent standing water from accumulating and creating a breeding ground for mosquitoes.
6. Comfort: Provide your dog with a comfortable bed and plenty of toys to keep them entertained. This will help prevent boredom and keep them happy while they are in the kennel.
7. Security: Make sure the kennel is secure and escape-proof, to keep your dog safe and prevent them from getting loose.