The recommended dimensions for a doghouse vary based on the dog's size and breed, aiming to provide comfort without excess space. A doghouse should allow the dog to stand, turn around, and stretch out comfortably. Ideally, it should be at least 25% taller than the dog's height at the withers (top of the shoulders) and long enough for the dog to lie down fully stretched out. For multi-dog households, consider a larger doghouse that accommodates both dogs comfortably, ensuring enough room for both to move without overcrowding.