1.   Ears immediately perked.

2.   Ears are perking all over the Metroplex as we speak.

3.   Ears perked and tail rigid, she pointed with an elevated paw to some predatory menace unseen by her masters.

4.   Her ears perked.

5.   On the Stars bench, ears perked, waiting to hear the certain whistle.

6.   Our ears immediately perked, so to speak.

7.   Suddenly, on her own, Toot began to pick up the pace, but balked, her ears perked, eyes alert.