Many standard dog beds are designed for softness. They may use fiberfill, thin foam, or plush padding. These beds can feel cozy at first, but large dogs may compress them quickly.
When a bed flattens, your dog may end up resting against the floor. This is especially noticeable around heavy pressure points such as hips, elbows, shoulders, and the spine.
For a large dog, “soft” is not enough. The bed also needs structure.