Your dog is curled up in the crate. You reach for the blanket and they growl. Pull your hand back and leave them undisturbed. A small space can make a dog feel trapped, and reaching in removes their chance to move away. Do not scold the growl, drag them out, or ask a child to reach in.
Give the crate a quiet location where people can pass without leaning over it. If something needs cleaning, invite the dog out with a familiar cue or a reward offered away from the crate, then secure them safely elsewhere before handling the bedding. If the dog will not come out and there is no emergency, wait rather than creating a confrontation. A sudden reaction or reluctance to move deserves a veterinary check. For a bite or repeated guarding, seek qualified, reward-based behavior support.
Rebuild a predictable exit
At times when the dog is relaxed, practice a cue to leave the crate voluntarily and reward them for coming out. Let them return sometimes so leaving does not always end rest. Keep valued chews and food in a spot where they can enjoy them without being disturbed. If another animal approaches the crate, use a gate or door to make a buffer zone.
A crate is not a place to test whether a dog will allow touch. The first successful change is a home where nobody needs to reach into a worried dog's small refuge. A professional can help decide whether the issue is the crate, the approach, a guarded item, or pain. For more on guarding a resting place, see the resource-guarding guide, the crate remains a space where the dog can be left undisturbed
Sources: Dogs Trust: Resource guarding in dogs. Dogs Trust: Playpen and crate training.