Unfortunately, D wouldn't be able to bring his entire petshop or magical suitcase with him. Items with space-altering properties (like bags of holding, or in this case, a shop-in-a-box), haven't been allowed.
If you were still interested in him though, he could bring one of his pets with him, as other characters who possess multiple animals or creatures in their canon are allowed to do so.
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If you were still interested in him though, he could bring one of his pets with him, as other characters who possess multiple animals or creatures in their canon are allowed to do so.