Each decor has a compatibility with sheep, which is determined by whether or not they are included in the same season's Lucky box. Miss Sommelier, for example, is only available in Season 3 Lucky boxes, and so only matches Season 3 decor items. The decor upgrade level will be fully implemented if a sheep matches the decor. Although, even if the decor level is greater than 3, if the sheep do not match the decor, only up to upgrade level +3 effects will be applied. This matching mechanism is applied to each sheep individually.