Mickie is a softened spelling of Mickey — which is itself a diminutive of Michael, meaning who is like God. On a male pet the spelling signals warmth over authority: Mickey is the bold version, Mickie is the affectionate one. The reference pool splits between Mickey Mouse and a general sense of mid-century American friendliness, both of which are entirely appropriate for a dog or cat who greets everyone they meet with enthusiasm.
Pop-Culture Lineage
Mickey Mouse is so deeply embedded in global pop culture that the name carries his energy regardless of the owner's intent: cheerful, slightly mischievous, fundamentally wholesome. A small dog named Mickie lives in that shadow, which is a comfortable shadow to inhabit. Chihuahuas with round, expressive ears have been known to receive the name for obvious reasons.
Sound Fit and Breed Preference
MIK-ee — two syllables, the first sharp and the second open. Easy to call, easy to extend affectionately. It suits small to medium male dogs and cats: Beagles, terrier mixes, and cats with a playful or nosy personality. The name implies an animal who is into everything and apologizes for nothing.
The Counter-Reading: The Spelling Doesn't Add Much
Mickie and Mickey are identical in sound. The -ie ending softens the visual impression slightly but requires no particular explanation. Owners who want to avoid the Disney association directly can choose Milo or Marty for similar energy with a different pop-culture anchor.