It depends on this Shepherd and this cat
Some German Shepherds share a sofa with a cat for years without a single incident, and some cannot be trusted in the same room. The difference is rarely training alone. Shepherds were bred to herd and to chase moving stock, and many carry a strong instinct to pursue anything small that darts away. A calm, dog-savvy cat who holds her ground and has high perches and escape routes is a very different housemate from a nervous cat who bolts at every sound. Judge the pair in front of you, not the breed's reputation in either direction.
Reading the dog before the cat is at risk
Watch how the Shepherd reacts to squirrels, birds and cats seen through a window or on a walk. A dog who fixates, trembles and cannot be called away from wildlife is showing you the drive you would be managing indoors. Puppies raised with cats from their first weeks usually learn the household cat is not prey, which is why a Shepherd puppy joining a cat's home is often an easier project than an unknown adult Shepherd moving in with one. Shelters that cat-test their dogs, or previous owners who can describe real lived experience with cats, give you far more to go on than a hopeful guess.
Introductions that keep the cat in control
Keep the animals fully separated at first, swapping bedding so each learns the other's scent without pressure. Feed on opposite sides of a closed door, then progress to a sturdy baby gate or cracked door with the Shepherd on a lead, rewarding calm glances away from the cat. Sessions should be short, boring and repeated for days or weeks, not rushed because the first one went well. The cat must always be free to leave, with litter, food and resting spots the dog cannot reach, and the Shepherd should never be allowed to practice chasing — even in play — because rehearsed chasing becomes a habit fast.
Living together once the novelty fades
Even a settled pair needs permanent management. Never leave a new Shepherd alone with a cat until months of calm behavior have earned that trust, and many owners sensibly keep separation when nobody is home for the life of the dog. Provide vertical territory — shelves, tall scratchers, rooms behind gates — so the cat chooses contact rather than enduring it. Watch for quiet warning signs: hard staring, blocking the cat's path, or guarding doorways matter more than wagging tails, which in a Shepherd can signal arousal rather than friendliness.
When the match is not a safe one
If the dog has previously caught small animals, or cannot settle at the sight of the cat after weeks of gradual work, forcing cohabitation is unfair and dangerous to the cat. A different home for one animal, or choosing not to adopt that Shepherd, is the responsible outcome, however disappointing. Plenty of Shepherds do thrive with cats — the point is to earn that outcome through assessment and patience rather than hope.
KinsLe's Family Sharing lets you give chosen grown-ups and teenagers access to the dog's profile themselves, so nobody in the house is working from a stranger's first impression of the dog.