Buddie is a phonetic respelling of Buddy, one of the most enduringly popular male dog names in American pet naming history. The IE ending softens it slightly and distinguishes a dog named Buddie from the ten other Buddys at any given dog park. It's a small act of customization that keeps the same warm, companionable core.
Buddy's Closest Cousin
Buddy has been a top-tier male dog name for decades. Buddie is its more personal variant, appearing when an owner writes the name from sound rather than convention. Golden Retrievers and Labrador Retrievers are the natural home for this name.
Pop-Culture Lineage
Buddy the dog from Air Bud (1997) locked the name into American pet culture. Buddie inherits all of that without being identical to it. See Buddy for the standard spelling comparison.
Counter-Reading: The Spelling Creates Questions
Buddie with an IE reads as a misspelling to many. You'll likely correct the vet more than once. If the distinction from standard Buddy matters enough to justify that friction, Buddie delivers it. If not, the original spelling is well-established and requires no explanation whatsoever.