Literal: in one's own lane or neighborhood even a dog appears like a lion.
2.
IndiaSouth Asiaproverbialcolloquial
Figurative: a person who is ordinarily weak or unremarkable can behave confidently or authoritatively in familiar surroundings or within their own sphere of influence.
Examples:
HI: होम हिंदी अपनी गली में कुत्ता भी शेर होता है
EN: The Dunn County Humane Society had a dog at their booth as well.