The Last Man on Earth (2015)

S1E8 Mooovin' In

Phil grows increasingly frustrated with the spotlight on Todd and hatches a plan to reclaim it by "stealing" a stray cow. However, when the cow genuinely goes missing, Todd manages to locate it and lets Phil bask in the glory. Later that evening, the friends are shocked to find the cow has somehow made its way up to Carol's house and is stuck on the stairs. This unexpected turn prompts Carol to officially move in with Phil. A quick flashback reveals Carol intentionally leading the cow upstairs.