The high bolstered edges of donut beds surround the dog, providing a sense of security and enclosure. This satisfies dogs’ natural instinct to seek out sheltered, den-like spaces where they feel safe and relaxed. The round shape appeals to this denning desire as well. Dogs can burrow into the center of the bed so the bolsters mimic the enclosed feeling of a den. The soft bolsters are also comfortable for dogs to rest their heads on. All of these factors come together to calm dogs’ anxieties.