You never want to have to tell your kid that their dog ran away.
Their little eyes will well up and you’ll have to likely spend the whole night comforting them, even if you already had plans. Then, after they stop bawling, they might start asking questions. How could he have run away? He was inside? Weren’t you watching? You better have a story ready. How you looked everywhere, knocked on all the neighbours’ doors, drove around to all the parks, sacrificing your whole day to find it.
But it’s better than admitting you drowned that yappy fucker in the sink.