Your dog has a chew in the living room. You walk past, and they go still, hold it closer, or growl. Stop and give them space. Do not grab the chew, scold the warning, or invite someone to walk by again to see whether they repeat it.
For now, give chews in a quiet area behind a closed door or secure gate, away from children and other pets. Let the dog finish undisturbed. If the chew is dangerous or has been swallowed, call a veterinarian promptly for help rather than reaching into a guarding dog's mouth. If your dog has snapped or bitten, keep people safely separated and seek a veterinarian and qualified behavior professional. A new guarding response deserves a health check too.
Change what your approach means
Some dogs learn that a person approaching means a valued item is about to vanish. Repeatedly taking things away can deepen that worry. A professional can help you design a gradual plan based on how close people can safely be. In easier, non-guarding situations, you can teach a voluntary exchange with an item your dog can give up comfortably, then sometimes return it. This is not an invitation to practice over the prized chew or to test your dog's threshold.
Notice the room layout. If everyone must pass the dog to reach a doorway, even a relaxed dog may feel crowded. Move chew time to somewhere they won't be interrupted. The first successful change is not making the growl disappear, it is making the dog and household safer. For more on recognizing guarding and planning safe changes, see the resource-guarding guide, do not test the dog by approaching their chew
Sources: Dogs Trust: Resource guarding in dogs. American Veterinary Society of Animal Behavior: Grrr... This Lap Belongs to Me!.