Exercise is a requirement, not a bonus
Tell a German Shepherd sitter exactly how much exercise he gets, because this breed's behaviour across a whole stay is decided by it. Write the real routine: walk lengths and times, any off-lead running in secure places, and the games or training that tire his mind as well as his legs. A Shepherd who misses that quota will not simply rest; he will pace, bark at the fence, herd the household, and invent jobs, and an unprepared sitter may read that as bad behaviour rather than unspent energy. Note also the wind-down pattern you use after walks, since a dog who comes home to a calm, predictable sequence settles far faster in a sitter's hands.
Commands must be word for word
List his trained cues exactly as you say them, with what each one means and what the reward is. A German Shepherd works for clarity, and a sitter inventing new words for sit, down, leave, or recall creates a confused, frustrated dog who then gets blamed for not listening. Include how you handle pulling, what equipment he walks on, and your rule for meeting other dogs on lead, whether that is a friendly hello or a calm cross-the-street. Add the commands he knows around the house too, such as waiting at doors, because a large dog who has been taught boundaries keeps them only if the sitter keeps asking for them.
Be honest about wariness and strength
Write plainly how he is with visitors, delivery callers, children, and unfamiliar dogs, including anything he guards, whether that is food, toys, the garden gate, or you. A Shepherd's loyalty means a stranger in the house is an event, so say how introductions should happen and whether he should simply be put in another room when people call. State his weight and strength honestly so the sitter understands what holding the lead actually involves, and insist on the security basics: gates latched, doors not left ajar, and no off-lead freedom anywhere unfenced, because a Shepherd who decides to investigate something will commit to it fully.
Feeding, health watch-outs, and contacts
Give measured meals and times, and note that big deep-chested dogs should rest calmly after eating rather than charging about. Flag the emergency signs that need an immediate vet: restlessness with a swollen, tight belly, drooling and trying to be sick without bringing anything up, or sudden collapse. Leave the vet's details, the emergency service, your number, and a backup decision-maker. Also note his ordinary quirks, such as seasonal itching, ear scratching, or stiffness after long walks as he ages, so the sitter can separate his normal from a new problem and tell you about changes the day they appear.
His place in the household
Close with his sleeping place, his favourite people-activities, and what comforts him when the house feels wrong, because Shepherds notice an owner's absence keenly and may go quiet or clingy for the first day or two. Say whether he is used to being left and for how long, and what the sitter should do at night if he patrols or whines. Compiling the whole brief in KinsLe's Care Pass lets your sitter step into your German Shepherd's exercise routine, commands, and emergency contacts without hunting through scattered messages.