Leptocyon (Greek: slender dog) is a small extinct genus of canid endemic to North America during the Oligocene through Miocene living from 24.8—10.3 mya, existing for approximately .

Leptocyon (Greek: slender dog) is a small extinct genus of canid endemic to North America during the Oligocene through Miocene living from 24.8—10.3 mya, existing for approximately .