Definition of "walkie"

It snuffles with its nose on Sylvia’s lap in the manner peculiar to a dog. And Sylvia addresses it in the following peculiar manner: “ ... And is-ums also looking forward to lovely walkie home with Mother and God-Uncle, then?”

1933, Rupert Latimer, The Unenchanted Circle, Appleton-Century, page 35

So if you hear a woman ask in a sing-song voice, “Do ya wanna go for a walkie?” you can probably safely infer that she is talking to her dog; there is a small chance that she is talking to a very young child, but virtually no chance that she is talking to her husband or an adult friend.

2012, Stanley Coren, Why We Love The Dogs We Do: How To Find The Dog That Matches Your Personality

Most dog walkers have a routine of sorts, so they take their dog for a walkie at a particular time of day.

2013, Michele Hanson, Absolutely Barking, Simon and Schuster, page ?

She shared a particularly adorable video captioned, “all the kisses. happy fall.”, that shows Myron wriggling around on the couch during an after-walkie snuggling session.

2018 September 24, Samantha Wilson, “Ariana Grande Posts Adorable Video With Mac Miller’s Dog Myron - Taking Care Of Him After Ex’s Death?”, in HollywoodLife.com