Loki calmed down once we learned how to effectively tire him out. And on occasion indulge his destructiveness with super cheap stuffed toys
Having Kaia with another dog certainly helps, not that Loki is always fond of it, but tackling him, biting his tail, being a general pest is great entertainment for her. She still gets into mischief, though it's far less than what she would do if we didn't have Loki. And it wasn't until the last couple of weeks that she's begun napping. Poor Loki loves his naps and she'd pester him because if she didn't want to sleep, then he certainly wasn't allowed to sleep.