Watch Will Arnett 'Let the Dogs Out' on 'Lip Sync Battle'

Will Arnett kicked off his Lip Sync Battle with Alison Brie by – as host LL Cool J noted – “trying to answer that immortal question, ‘Who Let the Dogs Out?'” Decked out in a purple track suit, the actor tackled Baha Men’s canine-themed, Grammy-winning 2000 single, the only Top 40 hit to feature…